Dellman,

While V-belts can and do get glazed and loose their traction (permanently) it sure looks like your alternator is maxed out on the tension. How about one size smaller on the belt length...would that allow you to tension it properly.

If the belt has slipped long enough it cooks the friction surface and no amount of tension will save it. Things like Gunk can harden it too so it slips.

I sure would try a new, shorter belt and be sure to tension it properly. After a hundred miles or so, it will stretch and you will need to give it another oink.

Stuart