Question about 1998 Chevrolet Cavalier

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Not charging battery but alternator good - 1998 Chevrolet Cavalier

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  • Chevrolet Master
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Hi.

The battery may be faulty, this is rudimentally tested replacing the battery.

Keep engine off and read the voltage at battery terminals. Voltage must be a minimum 12.4 Volts at alternator must have a drop of about 0.2 Volts. This test is done with engine off and car stereo, lights, Alarm etc. off.

Turn on the engine and read again. With engine on, the battery must have a minimum of 13.5, the drop at alternator must be same as before, with 0.2V difference respect to battery.

If battery is below this values, then replace battery.

If voltages are in range, then ELD, ECU, and power regulator must be tested.

The best way to proceed is removing the C connector to alternator. If there is a change in readings after disconnecting then the ELD (electronic load detector) is bad.

Regards.

Posted on Nov 14, 2009

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