I had the same problem. The belt would slip, and the alternator would become extremely hot in a matter of seconds. When the belt didnt slip, it wasnt so hot. Why? FRICTION!!! The best slips, causing friction. Friction causes it to heat up, and in your case break. Now, if I know about the effects of friction, you guys should. I'm stupid!! Tighten up your alternator so the belt doesnt slip. That way, it should be fine. Good luck!