Yes yes I know that. That isnt what baffles me. And no I dont have underdrive pulleys Im not paying 200 bucks for 3 or 4 horsepower I dont buy into that shi[t]. What does baffle me is that it have never shut off when Im really pounding my music sitting at a stop light, A/C, and lights on. I do know its not as hot at night so Im wondering if possibly the momentary draw of the radiator fan turning on is greater than my amp sucking the life out of the battery while thumpin some hardcore Sir-Mix-Alot.