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How do you know if its the diodes or the regulator if alternator isn't chargingOn A 94 Pontiac firebird?
Wiki User
∙ 15y ago
On any alternator you can check with a voltmeter -- disconnect the positive going to the alternator, use a towel or electrical tape to isolate it, then start the car and you should read DC volts accross the terminal of 12-16v if the diodes are working, if they arent switch it to AC -- if you read > 2v your diodes are shorted I'm pretty sure the diodes and regulator are integrated into the Alternator -- so just replace that, otherwise you can take it off and they can check it at any Kragens for free.
Wiki User
∙ 15y ago
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