Quote Originally Posted by FordMan77 View Post
My alt does the same thing. The old one did too and it finally quit charging one day. I slapped on a spare I had and it still does it. Sounds like junk and the pitch is ear piercing. Love to figure out if this alt is going bad too.
Think you answered your question. If it's making noise, something inside is going bad. It will keep charging if it's just the bearings, but eventually it's going to fail completely.