Alternators
Car Batteries

Can an alternator charge a car battery?

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2010-11-25 18:17:39
2010-11-25 18:17:39

That is the purpose of an alternator. The keep the battery charged and to run all the electrics on the vehicle. However it is never a good idea to allow the alternator to charge a dead battery. This will put a strain on the alternator and may damage it.

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Related Questions


Will the alternator kill your battery

you need the alternator to charge the battery with no alternator when the battery drops to about 10 volts car will not run at all.

older cars had a generator ,not an alternator, but you can always use a battery charger to charge a battery

I assume you mean how long to charge the battery. You should never let the alternator charge a dead battery if possible. The alternator is designed to keep the battery charged but not to charge a dead battery. You put a strain on the alternator and it can cause a diode to burn out. Drive home and then put a battery charger on the battery to fully charge it.

No, the alternator is used to charge the battery apperently.

You can start a car without a battery if you hook up a jump pack or use jumper camples but it could fry your alternator. It is pointless to charge a car without a battery. When you charge the car you are charging the battery.

if you boost charge a battery you should discinnect it from the car. if not you may burn out the alternator

It can depending on how much of charge that battery. How long it will run without the alternator also depends on the battery charge.

poor charge or intermitant charge from the alternator, also check condition of the alternator belt

Yes, the battery starts the engine, and as long as the battery is fully charged the engine will start. The battery will loose it's charge if the alternator is defective and not replenishing the charge of the battery but the alternator has nothing to do with starting the engine.

Sure, if the alternator voltage regulator is defective it can overcharge the battery.

It sounds like the alternator is bad. If the alternator is bad the battery will not hold charge when running

No, the alternator will not charge the battery with the negative terminal loose.

I am assuming you mean with the auto engine running. Yes, that is possible but you are putting a strain on the alternator of the car. An alternator is not designed to charge a dead battery. It is designed to keep a charged battery fully charged. as long as the ATV battery is the same voltage as the car battery, usually 12 volts, you can charge it, or jump start the atv and let it charge the battery itself.

No, this will place a very heavy load on the alternator of the car and may result in burning out the diodes of the car charging the battery. You could easily ruin the alternator. Purchase a battery charger and charge the dead battery with that. Alternators are not made to charge dead batteries.

To maintain the charge of the battery and provide power for accessories.

An alternator produces direct current that is used to charge up the battery while the car is running.

As long as the ignition switch is off, it will not damage the alternator.

It will start if there is enough charge in the battery to turn the engine over. However if the alternator is weak then the battery will not be charged fully.

Either the battery is bad and won't accept a charge or the alternator is not putting a charge into the battery. Have the battery tested. You can hook up an inexpensive volt meter to the battery while the car is running. You should see from 13.5 to 14.5 volts if the alternator is working properly. If it is less than 13.5 volts then the alternator is not charging.

The alternator does not hold a charge. It charges the battery. If it will not charge the battery then either the alternator is defective, battery is defective, or the connections are corroded or loose. You should read 13.5 to 15.5 volts at the battery with the engine idling. Check it with a DC volt meter. If you get less the alternator is defective. If you get much more the voltage regulator is defective.

New batteries almost always come fully charged. If it was not then charge it with a battery charger and do not use your vehicle alternator to charge a dead battery. You may do harm to the alternator which is not built to charge a dead battery but is instead built to keep a good battery fully charged.


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