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Voltage regulator is more than likely defective. The Regulator is built into the alternator so you will have to replace the entire alternator. Just make sure it is really overcharging. You should read from 13.5 to around 15.5 volts with a digital DC voltmeter if the alternator is performing as it should. Must more than 15.5 volts and it is overcharging.
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∙ 10y ago
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