It's not the same situation with the older generator models -- if the indicator light blows it can still charge. Checking the alternator is a relatively easy process. The alternator was doing its job of keeping the car running after the car started, but the battery can't hold a charge once the alternator is shut off. Why? Because the symptoms of a bad or faulty starter are pretty similar to the symptoms of a bad/dead battery or an alternator problem. Determining if it is the battery or the alternator at the root of your vehicle’s problem can be tricky. However, the engine will stall as soon as the battery charge is. In effect, the alternator produces three times the current of a generator for the same effort on the engine's part. In more severe cases your headlights could continue to dim until the vehicle stalls completely. Also, "battery too dead to for engine to run" is BS too- the alternator can provide *plenty* of energy for a spark. I have a 2004 Volvo C70. When the alternator is failing, there might not be enough power in the spark plugs to keep the engine alive, which can cause it to stall for no reason while running, or to have trouble starting. This misconception may come from my time in a parts store where the 'diodes?' would fail in the alternator, and I never thought an alternator could charge less than normal but enough to run the car. Adjust it if necessary by means of the adjustment strap on the alternator. Correct or no? Say I have a bad battery and use a portable jumper to start the car and go for a long drive--is this in anyway bad for the alternator or the car in general?. You should not do this in order to test the alternator by seeing if the car still runs or by checking the voltage at the battery. You would want to use the voltmeter leads to connect them to your battery terminals. Signs that indicate a faulty alternator or alt can be confusing. , Wooster, OH. During this 10 minutes the inside lights were flickering. If diodes are going bad and haven't died out the engine could still run. If that voltage is lower you may have a problem with your charging system. As has been said though, they're no big deal to add, just wanted to get the mechanical side of it running before I did the wiring, but it is only a. 8 to about 14 volts on the battery with the motor running. That means when your belt breaks, slips and, ultimately, wears out, everything—from the power steering pump to the alternator and air conditioner—stops working. My wife drives a Honda Accord. According to Nationwide , there are a few different ways to find out if you’ve got a dead battery or an alternator gone bad. When your car won't start, here are some ways to tell if you have a dead car battery or a bad alternator. A common reason for intermittent headlight dimming is a bad alternator. Both are problematic and should be determined immediately. By that time, the alternator had already died, and the car was running off the battery. A car battery is usually charged by an alternator. The solution is to replace a serpentine belt and a belt tensioner. I hooked up the alt exactly like the last but something isnt right. DVM negative lead on any clean metal ground and touch the positive lead to the post on the back of the alternator (engine running). Belt still intact, I. If the dashboard gradually dims, the alternator is likely at fault. Measure the ripple voltage by switch - ing your DMM to the AC volts function, 2 volt range,. If the battery is really weak or dead, the alternator cannot bring it back to life. After he can't jump start your car, he puts in his own known good battery and starts your car. Why service is important: Problems can be identified early and determined to be battery issues, cable or belt problems, or even the alternator itself. How to Know If It’s Battery or Alternator (Bad Alternator Vs Bad Battery) Having a bad battery or bad alternator can be really vexing especially if you can’t tell which one it is. All in all, what I'm trying to say here, is that you should probably go to a different mechanic and have the alternator checked out before this guy stiffs you. Click to expand anytime you run the battery dead, you've ultimately ruined the battery, both. If something is wrong with your alternator, starter or battery, a Firestone technician will talk to you about the different options you have when it comes to replacing or repairing a bad alternator or starter. More specifically, the voltage regulator is part of the charging system responsible for managing the output of the alternator and maintaining a full charge on the battery. Still runs great. Re: Good Alternator But Low Output to Battery 08/29/2008 10:44 AM Battery was fully charged and two new alternators were installed in succession as stated above. this is what it does in the main You can charge but you would. For more information on the battery, Click Here. The alternator was doing its job of keeping the car running after the car started, but the battery can't hold a charge once the alternator is shut off. An alternator charges a vehicle's battery. A serpentine belt that keeps slipping off the pulley is another symptom of a bad tensioner. Can a bad battery actually stop a running engine? I know that you need electrical power to spark, but I was under the impression that the alternator would provide that, and that disconnecting the battery from a running car would not cause the engine to die. I always figured that an alternator would either charge or not charge, but not just charge a little. To check an alternator, pop your vehicle's hood and hook up a voltmeter to the car's battery by connecting the red lead to the positive terminal and the black lead to the negative terminal. Alternator charging voltage can be checked using a digital multimeter at the battery terminals. Symptoms Of A Bad Serpentine Belt Just about every vehicle has a serpentine belt. Run your car at tick over then switch on the lights and then the fan you can hear the engine note change as the alternator kicks in. If the battery is. The knowledge of jumpstarting a car with a bad alternator is the only thing that can save you in that situation. Why? What can you do? A dead battery is the No. That would be the kind of heavy duty truck alternator that is designed to run at high output all day. To avoid more failure of your electrical system, a bad alternator can easily drain the battery power, as an example, ensure. Just for future reference, a quick easy way to check if an alternator's dioeds are bad is to get a Multimeter, put it on AC VOLTAGE. 2 volts, then start your car and rev the engine to 2,000 RPM. How long will a diesel run with no alternator a quandry? My Profile My Preferences Have a mate who has the kit to move it but need to get the car the 30 miles there. Determining if it is the battery or the alternator at the root of your vehicle’s problem can be tricky. Keep the engine running and check the voltmeter again. Have your assistant start the car's engine and let it run for a few minutes at 1200 RPM. Some of the other mechanics at my shop do, to save time. If diodes are going bad and haven't died out the engine could still run. (you can usually purchase a decent one for $20 or so, or borrow one) when the car is running the alternator should put out in excess of 12 volts (usually around 14) I would charge the battery to full capacity off of the car, then put it in and measure the voltage when you start it. The alternator provides a 'topping off' charge to help maintain the battery, but can't really be relied on to charge it. When your battery is not putting out enough power, the alternator has to work harder to keep. Or the contacts can corrode enough that they never electrically close, which results in the alternator not being brought into the charging circuit, causing the battery to run down. First make sure that the vehicle's battery is fully charged. If you are converting from a 3wire 10SI to a 1 wire regulator you can hook up all your stock connectors, and run it as is. After installing the alternator, he advised me to also get a new battery, as the alternator would be "working extra hard" on the deficient battery, and that would void the alternator warranty. If battery voltage is low without the car running, you may also have an alternator that is failing to charge the battery. By that time, the alternator had already died, and the car was running off the battery. The electronic system of the car should not be allowed to go without maintenance. However, batteries can die from other things as well, such as leaving your lights on or playing the radio with the car off,. If you are installing a stock 50 amp alternator, use the large red wire previously removed from the car or a new 10 gauge wire to run from the "B+" terminal on the alternator to the "30" terminal on the starter solenoid. Example: shorts, overloads, ECM problems. Having this happen on the side of a busy road or highway can create a lot of problems. A belt that is loose or too tight can result in improper running of the alternator. The purpose of the alternator is to generate electricity to run everything from your headlights to your head while the engine is running. Check all connections and test the alternator. If the car battery is not holding a charge from a bad alternator or serpentine belt, then you need to replace that part. A bad alternator can be ignored in the beginning but once these symptoms show up, you need to have it fixed as quickly as possible. With the motor running, and the alternator putting out power, the battery doesn't have much to do. The folks at Powermaster say to never test alternator functionality by removing a battery cable while the car is running. Belt still intact, I. Dimming Lights The alternator by itself can be the cause of dimming lights, fading radio, and/or stalling. If your alternator is slowly going bad over time there are some warning signs you can look out for. While a bad starter can look like other problems with your car, there are ways to tell if the starter has gone bad. Without a properly working alternator and alternator belt, the power that the car needs will not be supplied. That means the alternator is pumping out the juice. One of the time old tests of proving that your alternator is good is to disconnect the battery, if the car continues to run the alternator is good, if the car quits the alternator is bad. You can easily damage the alternator. If your vehicles Alternator is going bad it can cause a number of issues. Incoming search terms: Weak Car Battery,Weak Battery Effect On Car Performance,Can A Bad Battery Cause A Car To Run Poorly,Can Battery Being Low Effect Way Car Drives,Battery Improve Vehicle Performance,Can A Bad Car Battery Affect A Cars Performance,Can A Bettry Affect The Car Perfomance?,Can Batteries Affect Cars Power,Will Old Car Battery. Belt still intact, I. Because the alternator is connected to (and critical for) other vehicle systems, any mechanical auto problems can have an effect on its function and have an effect on diagnosing car problems. If you continue to run with a weak alternator, be prepared to also have to shell out the money for a new battery, as you're going to kill the one in the car. so its nothing left on. That means the alternator is pumping out the juice. Jan 22, 2016 · You skipped that second cup of coffee. " This is absurd. Without a properly working alternator and alternator belt, the power that the car needs will not be supplied. This can be tested by having the car running and checking the power output of the alternator with a device specifically designed to do just that. 2 volts, then start your car and rev the engine to 2,000 RPM. The work itself is quite straightforward, so the cost for labor is normally quite low in comparison to other automotive services. The battery would have kept the engine running and the red battery indicator light would have. Q) Will an alternator charge a dead battery? A) Alternators are designed to maintain a battery’s charge, not to recharge a dead battery. Find out more about your Alternator from Jim’s Auto Center, Inc. Don't be too hasty: The battery might be OK, but if the alternator can't generate the juice to recharge it, the battery eventually will run out of power, and your car will stop running. A car with a fully charged battery and a bad alternator will run until the battery is drained and then quit. If it leaks current in the opposite direction, it may keep the charging circuit on when the engine is not running, causing the battery to run down. If the dashboard gradually dims, the alternator is likely at fault. In a car, the alternator charges the battery that powers all the electrical components. How to start a car with a bad starter is a question that might've popped into your mind, when your car stopped just in the middle while you were making your way to an important meeting. You can try to recharge it with best battery maintainer, maybe it will help your battery keep alive. You can check the amount of A/C voltage leaving the alternator by putting your multimeter leads on the battery (Positive lead on +, and Negative lead on -), with you multimeter set on A/C voltage you should read no greater than. depends on the reserve of the battery, most batteries have about a 90 min. Remove one of the battery terminals, if the car turns off, most likely it's the alternator. If it leaks current in the opposite direction, it may keep the charging circuit on when the engine is not running, causing the battery to run down. However, a bad alternator can cause your car battery to drain and not be recharged. The alternator can drain a battery over time and shorten its lifespan, and you don’t want to unnecessarily run through batteries on account of a bad alternator. That only worked on the old cars and can damage the charging system on cars made after the 1960s or so. Whipped-Off Belt. One person told me it was the alternator, another told me it was the ac compressor, there is about a $500. An alternator that can put out more amps does no damage to your system. I used to be under the assumption that the car can't run with a bad alternator. How long can a truck run on a new battery with a bad alternator? My bf is 3. Yes, you can jump start a car with a bad alternator. He said his volts were showing low when the car was running and battery saver mode kicked on. As has been said though, they're no big deal to add, just wanted to get the mechanical side of it running before I did the wiring, but it is only a. Why service is essential: Problems can be pinpointed early and determined to be battery problems, cable or belt concerns, or also the alternator itself. and in response to the question, yes a car can run with a dead battery, or a dead alternator (as long as the battery still has some charge), but not if both are dead. They all illuminate when the key is "on". In fact, the alternator serves as the charger for the battery as well. "There are a lot of things drivers can do that causes their alternator to go out," Waits says. I can not find any information source that says this model vehicle has a main large fuse (100+ amps) between alternator and fuse box for just this problem, but many other cars do seem to have that. 1 cause of a no-start. However, a bad alternator can cause your car battery to drain and not be recharged. If I drive 150 miles without lights, radio, or a/c, do you think I can make it? I might pick up a new battery at the Auto store just in case. 5kw inverter through a battery to power a 0. 2 volts at idle (lights off). Use a voltmeter to check your charging system properly. So we put the larger pully on the new alternator. i have been having starting issues, and i did have an issue a few weeks ago where the radio flicked off on each of the 12 speed bumps to get to my house. If the battery checks out, it's time to look at the alternator. I was pretty sure my alternator was dead but my mother told me to keep driving it till it dies incase the battery just got flat somehow (bad advice). Whether you are going 25 mph around a roundabout or flying at 85 mph down the highway, suddenly losing power in your vehicle can be terrifying. If it's worn or loose, you may hear a squealing noise when you first start the car, and the alternator won't operate properly, even though the alternator itself may be fine. How to Know If It’s Battery or Alternator (Bad Alternator Vs Bad Battery) Having a bad battery or bad alternator can be really vexing especially if you can’t tell which one it is. There's a full 12volts on the battery. The fact that it decided to give up the ghost at 1 AM in a bad part of town, in the middle of an. If your vehicles Alternator is going bad it can cause a number of issues. It has one serious problem which it has had for several years now. Doing this would allow you to check whether the alternator is putting out enough current to run the vehicle. The diodes of the alternator can go bad, failing to transmit the required voltage. This can be tested by having the car running and checking the power output of the alternator with a device specifically designed to do just that. Have your assistant start the car's engine and let it run for a few minutes at 1200 RPM. However, a bad alternator could be a more serious issue since it could affect other components of the car. Belt still intact, I. I'm coupling a big (180A) car alternator to a Honda engine to make a generator I was just wondering if I'd be OK to run it to check belt run and tensioner before I add a battery and excitation wire. If something is wrong with your alternator, starter or battery, a Firestone technician will talk to you about the different options you have when it comes to replacing or repairing a bad alternator or starter. Also this bypasses the safety in newer cars that when not in neutral or parking the starter will move the car. How long can a car run with a bad Truck Alternator. The car will only run until the battery is dead if the alternator quits, which might be 5 minutes, might be 30. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for. Find out more about your Alternator from Jim’s Auto Center, Inc. One person told me it was the alternator, another told me it was the ac compressor, there is about a $500. During step two while your car is running , if your alternator tests above 14. One of the most common problems of a faulty alternator is a loosened belt. In a car, the alternator charges the battery that powers all the electrical components. Discharged sulfate batteries tend to degrade by sulfating, which involves the formation of large lead-sulfate crystals in the batteries. 5kw inverter through a battery to power a 0. If the car dies, alternator is bad. Any problems with it can quickly translate to problems with starting and running the vehicle, which opens up the possibility of being stranded on the road. If you hear this noise, with the smell of burning rubber, it can often be the signs of a bad alternator. Alternator test with a voltmeter. Elements of Electrical Systems Carrington, ND Alternator Inspections. The mechanic said it was the alternator. When your alternator begins to fail it can cause a variety of different electrical problems in your car, and eventually cause a breakdown. However, the engine will stall as soon as the battery charge is. 8 to about 14 volts on the battery with the motor running. alternator is normally a pretty easy fix. To prevent more failing of your electrical system, a bad alternator can easily strain the battery power, as an example, see to. Chances are if your car is running once jumped, the battery isnt holding charge and needs to be replaced because that means its running off the alternators power which is NOT what the alternator is designed for and can fry the alternator then youll have to replace the battery still AND replace your alternator. If the alternator is going bad, you will notice that dashboard lights appear dimmer than usual. How to Start a Car with a Bad Starter?. Diesel cars with dead battery and alternator. This misconception may come from my time in a parts store where the 'diodes?' would fail in the alternator, and I never thought an alternator could charge less than normal but enough to run the car. A battery with a short in it will cause the alternator to run at full output for extended periods of time, if not continuously - and they are not built to do this. Anytime you jump a car, you connect cables, turn dead car on, take off cables, and go for a little run down the block to charge it back up. What can happen in this case is that the alternator can still supply power to charge the battery to start the car, but insufficient to charge the battery and supply a heavy electrical load- lights, air conditioning, stereo, wipers, rear window heater, turn signal etc. This can be caused by a bad cell in the battery or from a bad alternator not charging the battery when the engine is running. When an alternator is going bad, the battery drains quickly. All of this happens once the car (and alternator) are warmed up (about 5-8 minutes after start up). If the alternator is good the car will continue to run, if it dies then you have a bad alternator this is why you would want to unhook the battery cable to check and see if you have a bad alternator. It might be a “new” alternator for his car…but it is not a newly built alternator. The temperature need only creep above 100°F or run below 10°F to result in very bad news for your car. There are only a few ways an alternator can go bad, but they tend to happen suddenly without a lot of warning. If it were true, no car in the world would run for 30 minutes after a battery replacement? NAH! It sounds like you have a bad alternator. Take some time to consider whether the starter is the problem so you aren't faced with being stranded in the near future. A serpentine belt is a single, continuous belt used to drive multiple peripheral devices in an automotive engine, such as an alternator, power steering pump, water pump, air conditioning compressor, air pump, etc. It is also possible that faulty spark plugs are causing your battery to drain. Paying attention to the 10 trouble signs on this list can make it a little easier to diagnose car trouble caused by the alternator. An alternator problem can quickly drain your battery, so if you see a warning light on your system, take your car in for service as soon as possible. Also, "battery too dead to for engine to run" is BS too- the alternator can provide *plenty* of energy for a spark. The slippage also produces heat that can harm the front alternator bearing and damage the drive belt. If your car starts the battery is good, it has no role after that unless the alternator is bad but if the alternator was bad the battery would be dead. DVM negative lead on any clean metal ground and touch the positive lead to the post on the back of the alternator (engine running). In the alternator, you can't do this trick as the brushes are built into the internal regulator and they both get replaced as a single unit. If you can drive for at least 1 hr with headlights on, and their brightness is not lower after hour with engine on. If you are installing a stock 50 amp alternator, use the large red wire previously removed from the car or a new 10 gauge wire to run from the "B+" terminal on the alternator to the "30" terminal on the starter solenoid. I told my daughter (her car) I was 98% sure it was just a bad battery - but it is possible something else is wrong. That allows you to run small electrical devices that you normally plug into a wall receptacle. If you have headlights,fog lights,driving lights, aftermarket accessories that take up power. During this 10 minutes the inside lights were flickering. I started a Polaris atv without a battery and it blew every light bulb, because the battery was removed to stop the unwanted voltage. If the car does not run with a batterie in it than it is the alternator. it may not be the alternator ===== a simple test would be to replace or charge the battery then disconnect the alternator - and run the car if the symptoms are no longer present the alternator is SUSPECT , but actual testing under load will be needed to confirm that if the symptoms are the same with the battery fully charged and alternator. CAUTION: A defective or discharged battery can damage your new alternator! WARNING: NEVER disconnect the battery cable with the engine running! This could be dangerous to you and damage your charging IMPORTANT: Check to see if your alternator is externally regulated (look for a label on the outside of your new alternator). They can test your equipment for you and if either or both are bad, you can get new ones on the spot for a lot cheaper than a shop will charge. If you're unable to restart your car after it has been jumped, the battery is probably the problem. Once the alternator goes bad, the car runs off the battery until it goes dead. Besides water boiling out of the battery, I also noticed that the alternator was very hot, which seemed reasonable under the circumstances (output voltage of 15-18 volts). Signs of a bad alternator. A vehicle's electrical consists of many parts but the ones we're interested in are the battery, the alternator, and the power wiring. 70+ channels, more of your favorite shows, & unlimited DVR storage space all in one great price. I hooked up the alt exactly like the last but something isnt right. Get the car fired up and check voltage with the lights and heater on. A car without any electronic upgrade meaning big 3, dry cell batts, alternator upgrades is only capable of putting out what it has to offer so say you have a 100 amp alt and while your car is running it uses say 40% of the power then then leaves you with 60 extra amps to work with, which if your running a little over 13volts that gives you 800. 5V or more with the engine running, there is a connection problem downstream. If your alternator is bad it won't recharge your battery while driving, meaning that the battery's juice will drain as you drive and try to start the car. For this test, the mechanic will charge you a fee, which could be anywhere around $250-$350 depending on the make and type of your vehicle. It's a good possibility that it's the alternator right?. The old one never went over 14V and usually hovered around 13-13. 2, your alternator is creating too high of a charge and likely has a voltage regulator problem. The meter should read 14 amps while it's running, don't let them sell you an alternator and find out later it was the battery. Only then can you be sure that your automobile has the energy it needs to run properly. If the alternator is working but the battery is not, then the motor will continue running with the power provided by the alternator. I’m actually gonna park the car in this would be a first for me back the car and jump from the truck to the truck. After sitting for enough time for the alternator to completely cool. Wiring, Electrical and Installation Help Enclosure Design & Construction Help Car Audio Build Logs Classifieds Wanting to Buy/Trade Head Unit Classifieds Amplifier Classifieds Speaker Classifieds Subwoofer Classifieds Miscellaneous Car Audio Classifieds Miscellaneous Classifieds Classifieds Member Feedback. This means that when the battery dies out, the car will be rendered unusable. A bad or weak starting battery causes additional stress on a charging system, starter motor or starter solenoid. 2, your alternator is creating too high of a charge and likely has a voltage regulator problem. Headlights, Blower motor, radio etcc I made it about 2hrs a truck with a bad altenator. Just for future reference, a quick easy way to check if an alternator's dioeds are bad is to get a Multimeter, put it on AC VOLTAGE. Watch for the instrument cluster to blank out, I think you can still drive for a while after that but it is time to pull over. When you change out a bad battery, be sure to obtain a replacement that has the cold cranking amps that your auto needs. It turns out that car batteries eventually experience battery sulfation, a build-up of lead. First, the sun heats up the metal to the point it's scalding hot to the. Also, making that kind of alternator test is a bad idea. Bad alternator symptoms: Dim lights. The best option you can do with a bad alternator is to replace it with a new or used one. Lights will typically dim, and the engine may die. 2 volts) to effectively charge a 12 volt car battery. Incoming search terms: Weak Car Battery,Weak Battery Effect On Car Performance,Can A Bad Battery Cause A Car To Run Poorly,Can Battery Being Low Effect Way Car Drives,Battery Improve Vehicle Performance,Can A Bad Car Battery Affect A Cars Performance,Can A Bettry Affect The Car Perfomance?,Can Batteries Affect Cars Power,Will Old Car Battery. Usually, the problem falls into. Doing this would allow you to check whether the alternator is putting out enough current to run the vehicle. This CAN BE the "EXCITER" wire. When your alternator begins to fail it can cause a variety of different electrical problems in your car, and eventually cause a breakdown. Adjust it if necessary by means of the adjustment strap on the alternator. However, the engine will stall as soon as the battery charge is. If you purchase a refurbished or re-manufactured alternator, it will cost between $200 and $500. Can a bad alternator cause car not to start? I have a 1997 Buick Riviera. Here are a few reasons why your car could stop running while driving. Have someone check it out along with the alternator as it may not be charging properly. The alternator may be old and the noise may be due to worn bearings but if it’s working, it’s working. A car battery is usually charged by an alternator. Starting issuesbad alternator? Soafter having problems starting my car over the last few months (I thought it was heat-soak problem as the starter is so close to the exhaust manifold) I fitted a brand new starter. trickle charger)-- though it was still starting the car, operating all systems. You may have the urgency of catching a flight or joining a meeting, so don't have time to take the car to the garage. my car shut off while I was driving and then started back up and shut off again a few minutes later. How much will it cost to fix a battery or alternator Changing out your battery is a fix that you can usually do on your own. Most auto parts stores will test them for ya to. If your vehicle stops running while you were driving, we call that a "Died in flight" situation. The car alternator converts all the mechanical power of the engine into electricity that will run all of your vehicle's electrical devices. 5 volts with the ignition ON and the engine running. You can home test to see if its charging at all. Obviously, batteries sometimes fail on their own--but a bad alternator can actually cause the battery to drain because it's failing to recharge it. I figured that the alternator was bad, but after trying a new battery first the car seems to be running fine. Have someone check it out along with the alternator as it may not be charging properly. With the engine running at 2000 rpm, however, the voltage level still ready only about 12. Why? Because the symptoms of a bad or faulty starter are pretty similar to the symptoms of a bad/dead battery or an alternator problem. Have your assistant start the car’s engine and let it run for a few minutes at 1200 RPM. 5 volts could indicate a bad battery, failed regulator or poor wire connections. Not run the car with the cables connected. So would this alternator work fine with my 2002 Protege 5 and not damage my ECU? #3 I am looking into buying this alternator for my 2004 WRX with a 2. If you can drive for at least 1 hr with headlights on, and their brightness is not lower after hour with engine on. I’m gonna jumpstart the truck, let it run and check what kind of voltage I’m getting out of the alternator back to the battery. not electricity. I’ve already apply this formula on my BMW 335i when I found the battery was dead. However, batteries can die from other things as well, such as leaving your lights on or playing the radio with the car off,. Obviously, batteries sometimes fail on their own--but a bad alternator can actually cause the battery to drain because it's failing to recharge it. Took the car to mechanic results need to change the alternator with the pulley since it comes in one piece. This article explores the possible causes of why your Honda Accord's engine is losing power. It should read something above 14 V while charging, alternator output varies with different makers. If the alternator requires replacement, your vehicle’s electrical system will perform erratically, its battery will discharge, and eventually your engine will lose power. reserve, that means the battery will last that long before it is completely deadit also depends on how old the battery is and how many accessories that you have running as well, like everyone else said, if you alternator is out, do not use your headlights, the a/c or heater and when you come to a stoplight, put it. It turns out that car batteries eventually experience battery sulfation, a build-up of lead. When your alternator begins to fail it can cause a variety of different electrical problems in your car, and eventually cause a breakdown. If I drive 150 miles without lights, radio, or a/c, do you think I can make it? I might pick up a new battery at the Auto store just in case. Why? Because the symptoms of a bad or faulty starter are pretty similar to the symptoms of a bad/dead battery or an alternator problem. Alternator Replacement Cost. If the battery is really weak or dead, the alternator cannot bring it back to life. Five things never to do to your car. IMO you messed up your alternator by running it like that. Whether you are going 25 mph around a roundabout or flying at 85 mph down the highway, suddenly losing power in your vehicle can be terrifying. 5 volts with the ignition ON and the engine running. Run the engine and open your ears to how the alternator sounds. Because the alternator is bad, you will not have much time before the battery drains again, so it is best to get to a dealership or auto parts store to have the alternator replaced. This can be often identified by headlights that project a brighter beam than usual. A reading exceeding 14. The battery would have kept the engine running and the red battery indicator light would have. Leave your vehicle running for a few minutes and see if the power stays on. Depending on what you are driving is how long it will run like that. I replaced the alternator and battery each more than once to no avail. and in response to the question, yes a car can run with a dead battery, or a dead alternator (as long as the battery still has some charge), but not if both are dead. For more information on the battery, Click Here. If you hear weird noises, especially coupled with the other listed symptoms, your alternator may be going bad. Battery: Provides power necessary to start the vehicle, and powers accessories when the engine is off. Having this happen on the side of a busy road or highway can create a lot of problems. put a lead on each terminal while the car is running. Diesel cars with dead battery and alternator. Sure it *could* be the alternator as all others say, but I doubt that would die so quickly on such a new bike. Also please check out the statistics and reliability analysis of Lincoln Town Car based on all problems reported for the Town Car. If it's worn or loose, you may hear a squealing noise when you first start the car, and the alternator won't operate properly, even though the alternator itself may be fine. If the battery is. The alternator provides a 'topping off' charge to help maintain the battery, but can't really be relied on to charge it. Why service is necessary: Issues can be pinpointed early and determined to be battery issues, cable or belt problems, or also the alternator itself. However, the engine will stall as soon as the battery charge is. An alternator is bolted to the engine and is driven by a serpentine belt (drive belt). Also, making that kind of alternator test is a bad idea. First make sure that the vehicle's battery is fully charged. Anyway, I think it's the alternator, because a friend told me that if you unplug the battery while the car is on and it shuts off, the alternator is bad. Example: shorts, overloads, ECM problems. Put a screwdriver in it when the car is running and use it to ground what it touches on the inside to the case of the alternator. The 05+ gasser and the 6. Natnan Srisuwan/ThinkStock While not technically an alternator problem, a car that won't start is a definitive sign that there's a problem in the starting system. To prevent this from happening at the most inconvenient time pick up on these 5 symptoms before your car’s lights go out! Signs of a Bad Alternator. Jumpstarting A Car With A Bad Alternator: The Procedures Most of us use the air conditioning, heater, music player, and other amenities in the car without thinking about the energy source. How to Start a Car with a Bad Starter?. Just for future reference, a quick easy way to check if an alternator's dioeds are bad is to get a Multimeter, put it on AC VOLTAGE. Both are problematic and should be determined immediately. re: alternator drag how much hp drain? Glad to see someone took the time to explain the relation between electrical load and load on the engine. If your battery had enough power to start your engine, your bad alternator did not cause it to shut down. The problem comes when you try to restart the car.