Cheap belts or wrong belts would be my guess.
I've seen cheap belts stretch like a rubber band. It may not be but an inch or so in alternator adjustment. When a good belt is tight, IT'S TIGHT, and doesn't 'stretch' tighter.
Wrong belts, Belt width has to be matched to pulley groove width. With wrong width belts they (one of the two) has to slip (on the water pump pulley) because it's running at a different speed. The further out in the pulley groove a belt is, the faster it travels.
PS belt use to be slightly wider than the alternator belt. The pulley grooves were also a little wider.
So, belt width properly matched to pulley groove keeps the two belts speed the same. Mis matched (belt to pulley width) and one of them has to slip on the water pump pulley. No amount of tightening can correct it.
Cheap chain store part consolidating, trying to make 'fit-um-all' stuff, just don't work in these situations.
Clay
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All the federales say,they could've had him any day
They only let him slip away, out of kindness...I suppose
Poncho & Lefty
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