Sounds like a loose belt to me. Just tighten it. If you dont have a threaded rod to tighten with, loosen the adjusters, put a big screwdriver between the alternator and engine block and pry, then while the tension is on, snug up the adjuster screws. I doubt you need to loosen the pivot bolts as the prying will overcome them. It sounds a bit agricultural but its all thats needed. If you can play music on the tightened belt, its too tight so slacken it a tad.
Steve
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