The alternator on my truck makes a squealing sound, like the sound of a belt squealing. I removed the altrernator and there isnt any play in the pully and I cant replicate the noise (it only occurrs at over 2k rpm) Is there a replaceable part in there like a bearing? The truck is a 89 22re and the alt is a toy part so it could be the original. Oh ans I know it is the alt as it made the sound with that being the only belt driven thing then after removing the belt, no noise. There isnt a tensioner pully either, so it has to be the alt. thanks.