I recently had to change the OEM alternator on my 2001 Pontiac Grand Prix GTP. I'm sure most of you could swap an alternator out in your sleep but I took pictures of the process and wrote up a quick guide for the new owners.
The procedure should be very similar on every car that has the GM 3800 Series II engine.
Here's the guide -
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Cheers, Paul Michaels Ft. Lauderdale, FL