A few people have reported that the only fix to their belt squeal, after trying several, was a genuine belt... but that means it has to be the belt and not a drive pulley or ancillary bearing (Alt, A/C, Tensioner etc) squealing (obviously).
The Alternator has a Sprag Clutch in the pulley assy.
The reason for the sprag is that Mr Nissan is trying to damp out belt whip when the engine stops
If the sprag is faulty it will squeal louder than a Forum Veteran when a Newb posts 25 loads of shit to get a manual.
Then there are two choices...
A) replace with factory sprag clutch
B) replace the Sprag or 'Overrun' Pulley assy with solid drive pulley
Not sayin it is the sprag but don't rule it out
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