Car Starting Problems
Car Batteries

Why might a car battery not keep a charge?


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2015-07-17 17:31:08
2015-07-17 17:31:08

I would first have the alternater tested to be sure that it's good. If it is then make sure you're getting voltage to it when you hook it up on your car. If you take jumper cables off and it dies you're not getting voltage to the alternator. You could have a bad battery and if you're alternator is working right the car would still stay running even if you take jumper cables off. Check all wiring going to alternator thats more than likely your problem also check your grounds and ground wire to the alternator.

I had the same type of problem. It was a bad fusible link. I just ran a wire to the 10 mm bolt on the back of the alt. to the battery. This wire has to be thick though. And I would definelty put a battery charger on the battery. Also check all grounds to the motor.


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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.

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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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if you charge it for too long. keep a close eye on it as it is charged.

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If the battery is defective get a new battery. If you just left something on and ran it down, charge the battery and keep going.

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to keep your battery charge and help provide your vehicle electricity

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