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Defective voltage regulator. In almost all cars today the voltage regulator is located inside the alternator. Have your charging system check at almost any auto parts store. Or you can check it yourself with a digital DC voltmeter. You should get a reading of 13.5 to 15.5 Volts at the battery with the engine running at idle. Anymore than 16 volts and your voltage regulator has failed.

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13y ago

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