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90A Alternator noise questions



I had a used 90A alternator for my Scirocco lying around, so I hooked it up
and boy did it squeal like a PIG!

 I just figured the bearings were all rusted-out and ready to give-in, so I
ordered a new 90A alternator (remanufactured in Germany by BOSCH).

Just came in the mail today, so I hooked it up and...

 IT SQUEALS LIKE A F**KIN PIG!

What in tarnation going on here?  Are these units inherently loud for some
reason?

Anybody got the scoop on these noise makers?

Thanks in advance!

David Guido
1980 16v project
1981 S daily driver