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Check pulley-to-alternator frame clearance. The pulley may be rubbing against the front of the alternator. I've run into this before. As in your situation, my first impression was to blame a slipping belt. A bad diode will also create such as noise. Check battery voltage with the engine running. It should be about 14.5 volts.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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