so i got my new car not too long ago and it had no alternator belt on it, the guy gave me a new one with the car. the one he gave me was too long so i had to buy a shorter one. well yesterday i heard a noise and looked and both belts came off. i found the alt belt on the side of the road but the powersteering one was gone. so i fixed it and bought a new power steer belt and then today driving the alternator belt came off. im assuming it broke because the powersteering belr is still on the car. i have an unadorthadox underdrive pully and thats the only aftermarket thing concerning the belt drive. any suggestions why it keeps breaking?