Sounds like belt squeal, but you'll want to find out why and fix it. Doesn't seem like any fun to have it burn up while out on the lake. My 04 black scorpion has a tensioner pulley. Could be the alternator, raw water pump, water circulation pump, or either of the two idler pulleys. I would pull the belt off and spin the alternator and idler pulleys by and and push them back and forth looking for play in the bearings. Could also just be an old belt.
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