I had a '96 Lumina that died on the highway near an exit. Luckily, there was a Pep Boys at a plaza off this exit. I knew it was my alternator, and I replaced it on shoulder of the highway with a flashlight. It was dark and snowing. I called for someone to give me a jumpstart and I was on my way. The point in all of that... it was very easy to do.

I now have a 2004 Monte Carlo SS, 3.8L Supercharged (the Earnhardt one).
I also have a Haynes manual. I got an alternator at NAPA. I also wanted to change the belts since I was in there. Well....
The Haynes manual doesn't even have the word supercharger in it's glossary. The few 3.8L examples they show, are not my 3.8L SC.
No way that one serpentine belt is fed through both the supercharger pulley and the adjacent regular pulleys. But all my local NAPA/AutoZone/AdvanceAuto stores says this is the only belt my car takes.

I suppose I could have just posted this question:

Anybody know where the tensioner is on a 2004 3.8L Monte supercharged engine? I guess there should be one for the regular water pump pulleys, and another for the supercharger belt. If I can get the belts off, I can change the alternator. Thanks for any help...

 

GM Pontiac Grand Prix Supercharger Belt Replacement Guide - 3800 Series II Engine With Eaton M90 - Pictures & Instructions

This ought to be exactly what you are looking for.

 

Thank you VERY much. I remember that web page, I used it to change the supercharger oil once. I completely forgot about it. Again, Thanks!