Pontiac Problems? Ask a Mechanic for Answers ASAP
What brand of alternator are you using for the replacement? Remanufactured or new?
We see a lot of out of box failures on alternators for these cars. They typically will charge for about 15-20 minutes and then the output drops too low to keep the charging system out of failure mode.
The autozone (Duralast)and oreilly (ultima) house brands tend to fail most often.
Can you test the output of the alternator?
You will need a multimeter.
So the new battery turned out to be bad?
It's hard to say. I see a lot of out of box failures on those Autozone alternators. If the light doesn't go out with a new battery I would definitely look at the posibility of the new alternator being bad.
I just wanted to check and see whether you needed any additional help on this one.
Please don't forget to rate if I have been of some assistance.