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Voltage regulator problem?


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I bought a 80 amp alternator from Ebay years ago and its been great. Recently the alternator doesnt seem to be working at low RPM, as the lights are dim at night. If I rev the engine to 3500 to 4000 RPM the lights instantly get bright and stay that way. I remember some one here saying it was a voltage regulator issue.

Is that the problem or could it be something else. Ive taken the alternator to a Pep Boys and Autozone and either their tester is broken or they cannot test my alternator for some reason.


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