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Your belt is self tensioning. This is done by the tensioner which is a pulley looking thing in the belt path. You can tell it by it's smooth, shiny surface and by the fact that the back side of the belt contacts it. It's possible that the spring in the tensioner has worn out. I'm really not sure how big a job it is to replace that tensioner, but naturally, the belt will have to come off to do it. Beyond that, there will probably be some peripheral parts removal. Or not.
Another option is that you might need to adjust the tension a bit by adjusting your alternator. It has a bit of fore and aft adjustment and it's pretty obvious how that works.
I guess your belt may have stretched too, but I don't know that to be a common problem. If I were you, I'd consider replacing the belt. At that time you can push against the tensioner to see if it still has plenty of spring left in it or not.
FriPilot
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