Alternators
Car Batteries

Why does an alternator not over charge the battery?

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2012-11-12 01:12:36
2012-11-12 01:12:36

Alternators have a built in regulator that keeps the voltage at about 13.5 Volts. Depending on the load, the alternator may be putting out anywhere from just a few amps to full capacity of over 100 amps for some alternators. Batteries charge at anything over 12 volts and handle about 14 volts without any problem. You start causing problems for your battery and other parts of your electrical system when the voltage goes over about 15 volts. But then, if your regulator is working right that should never happen.

The current (amps) of an alternator does not vary. if it is a 100 amp alternator, the amperage coming out is always 100 amps.

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Will the alternator kill your battery

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

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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.

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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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No, the alternator recharges the battery. Of course the alternator is turned by the engine.

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With a battery charger or alternator.

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