i am new to this forum and wanted to know if anyone has had seen this problem before. I purchased my car about 2 years ago with 22000 miles on it and after 3 (months about 3200 miles) i noticed that the alternator bearing was making some noise so i brought it in to the dealership and they installed a new alternator. now after about 10000 miles it is doing it again. i checked and the belt doesn't seem loose or tight. any help would be great.