For the second time in 6 mo my '90 Jimmy threw a fan belt which wipes out the a/c electrical connection. It did this again this afternoon, but this time the parking brake light is staying on and the speedometer quite working. The first time it did it, the cause was a slightly loose pulley under the alternator. This time, I am not sure, because the pulley seems to be tight. Any thoughts would be appreciated. Derf00 "A WISE MONKEY NEVER MONKEYS WITH ANOTHER MONKEY'S MONKEY."