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Originally Posted by 99firebird
I have a 99 with a v6. As far as I know the voltage regulators in GM products are in the alternator. It is in mine. When my original alternator went bad I got a rebuilt one from NAPA. The original tested bad on their tester. The replacement didn't put out a charge. With everything contained in the alternator I figured that could only mean I got a bad replacement. It tested good on their tester. I had them get me a different one anyway. The second one worked. Shows you can't always trust their testers.
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The best way to test a alternator is on the car.
I do not want to start a Napa war but Napa has went down hill on quality parts along with a lot of other after market rebuilt stuff.
Next time consider a Dealer rebuilt alternator.
They only hurt one time.
Your cheaper after market stuff will bite you many times.