bad bearings in accesory..which one?

I have a 96 CV pi with 160k.
by dead reckoning, i believe either the PS pump or the alternator is producing a loud high pitched cyclical squeak.

Squeaking goes away under moderate load.

Is there any way to tell for sure without possibly replacing the wrong one?

also, should i run it without the belt to rule out cams?

Try the Crown Victoria forum below.