Driving on the interstate at approximately 75 mph, I felt a jolt, heard a loud pop followed by a whoosh and the battery light and I think the antilock and SRS light come on.

I immediately thought that I lost either just the alternator or the serpentine belt. Luckily I was right by an exit, so I gunned the car and cut between teo semi trucks and off the freeway.

I shut off the engine on the off-ramp, but the temperature still got up to nearly the 120C mark (!!!). I parked on the offramp, popped the hood and the belt was in 2 pieces. I pulled it out of the pulleys, let it sit for a couple minutes and let the aux pump drop the temperature about 5 degrees before starting the engine for another 5 seconds to bring me to the shoulder of a country road. I called someone to bring the trailer down. I left the key on, pulled the temp down to 40C before resigning myself to waiting for the trailer to arrive.

The alternator pulley is totally loose...it will wobble about 20 degrees off its axis. I think the shaft broke, bearing may have siezed.

Anyway, here I sit...let down by my always faithful 300D. Back to driving the Saturn, I guess!