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could be voltage regulator or sometimes the alternators from the store are bad best thing to do is have them test it before you leave the store or even purchase it you should look for a problem outside the alternator. if you replaced it with a decent rebuilt or new and are still having problems check the battery, battery cables and your ground cables. Make sure your battery is secure and nothing can short across the terminals. This can burn out the regulators. Check your belt tension as well if it is loose the alternator pully might not spin properly.

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Q: What would cause the alternator in a 98 Pontiac Transport to keep on going bad?
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