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When I've had water pump or alternator bearings fail, they tend to sound like they're pumping pebbles instead of water or electrons.
"...can't tell if it's belts, water pump or alternator..."
A mechanic's stethoscope (or a long screwdriver, used very carefully) works wonders in these situations. On the alternator, you can even distinguish front from back bearing.
If it's a squeal (and your alternator belt's tight) then Mr. Haire's suggestion should be first on your list.
Don Foster (near Cape Cod, MA)
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