So a few weeks back the alternator on my Buick started making a strange racket. I popped the hood only to find that the alternator housing had cracked. Purchased and installed a new alternator and while I was at it a new belt. Here is where I'm Stumped. No matter what I do I can't stop the belt from squealing. It was fine for about the first ten miles then it started making a squeal. I have tried tightening the belt, loosening the belt, applying a dose of belt dressing, and swapping back the old belt (which I thought fixed it until I got about five miles down the road). On the return trip from town once the old belt started squealing I hit a bump and the squeal stopped until I let off the gas and then it started up again. I believe it may be an issue with the pulley on the alternator but I am not sure. Any ideas would be greatly appreciated!