Is the squeak constant? high pitched? does it vary with RPM?

Are any of the pulleys loose? can you wiggle any of them when the engine is OFF!!

I would use a belt conditioner to rule out the belt.

If you have a long screw driver, you can carefully place the tip of the screwdriver on the generator/alternator, valve cover ect. put your ear on the handle end and listen. (be careful around moving parts)


Another quality post.
Real Trucks Rattle
HELP! The Paranoids are after me!