Had some intermittent squealing from one of my v-belts. I figured it was prob the alternator belt since it would mostly do it under an electrical load. Popped the hood this weekend and got a chill from what I saw. The pivot bolt on the alternator had come loose ( or wasn't tightened properly when I replaced the belts) and was inches away from the fan. I can only imagine the damage that sucker would have done if the bolt reached the fan. Fortunately it's all under check, belt tension back to where it should be, and the only squealing is from the passengers.