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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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A tight belt is less likely to squeal and a shot of water onto the belt is a good test to be sure it is the belt if it changes the noise temporarily. A belt can be too tight, and cause the pulleys/components/belt path to be misaligned. The rubber alternator mount bushings could collapse and cause problems after a few years. A squeal would indicate slippage and that is bad.
Alternators can whine if under load. That is probably normal, but it shouldn't be that loud. Bad diodes/shorted windings can cause excessive whine and may cause charging and ignition-off draw issues.
 
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