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Autozone tester is hit and miss. Sometimes it won't detect a bad diode trio (rectifier bridge). This is probaby your problem. Get a new alternator, retest.
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this is also very true.
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Originally Posted by JJ Alfano
Do you mean stick a multimeter on the positive terminal?
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Yeah on the pos and neg on battery, turn on and make sure its between 13.8 and 14.6 (i think). Then put a load on it headlights on and heater fan on high. It will drop a bit but then return back to the normal range.