Check the bolts on the alternator,
there are 2 on the bottom and the
one that tensions the belt. I have
trouble from time to time with the
bolts loosening and falling out, I'm
about to get rid of the bolt in favor
of a pin and a lock ring, would make
changing the Alt easy too, the top
bolt needs to be tightened good to
keep the belt from slipping, I stick
a big wrench or screwdriver in the
gap between the engine and the
altenator and get the belt good and
tight, then snug that bolt on the top
good, and locktite it so it will stay in
Wild