[57sailplane]

say,

i see something out of the norm here. when i here squeaky belts its usually cause of 2 reasons first they get old and dried out. second is what i see in your first photo. something sprayed the engine compartment be it oil, antifreeze, muddy water or what not. you say you put new belt on with the new alternator and it stated squealing sometime later. i would guess they got wet with something. have you tried a bar of soap. another old man trick. do this at your own risk. go get a bar of soap and run engine. be careful and run soap on the under side of belt. keep hands and sleeves away from belt and pulleys just put one end against the belt. it should make a slight groove on the bar and stop the squealing. remeber try this at your own risk.