Reply to "Battery Issue?"

joe1974l6656Member

There are 2 schools of thought on this;

1 measure the battery before you start the car... start the car if the voltage is 1 volt higher than the at rest voltage of the alt. It is working.... if not at least one volt at regular idle then the alt could be bad.

2 Start the car... at idle the voltage should be 13.5 / to 14.7 with a little reving of the motor.

IMHO 15 volts is high and could burn up the cells in your battery before I would change the alternator ...I would give a good look at the voltage regulator and check your grounding and current paths.

1/19/1412:59 PM

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