How To Troubleshoot Your Charging System
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6 A Mustang’s 12-volt battery should show 13-14 volts at idle speed. Bring the engine speed to 2,000 rpm and the voltage should hold around 13-14 volts, but never more than 15 volts. If voltage fails to rise above 12 volts, the charging system isn’t doing its job. View Related Article
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