Noisy Idler Pulley
 

I have a solution to those of you that might have a high pitched idler pulley behind the Alt . I've did this and it worked ...Remove tire ...Then that belt cover that is bolted to the inner finder ..Start engine and spray PB directly on the idler pulley (Center behind the large washer) . The PB lube will soak in behind the washer as the engine is running . It's a temp fix but it might last a long time . Just my .02