i doubt that the aem gears slow down the alternator enough to drain the battery. Im almost certain there isn't a harmonic damper in the alternator or power steering pulley. I know there is on on the crank but this would not be removed. The alternator isn't totally shut off just slowed down a bit. I doubt you even have to drive hard to get enough voltage for you system. Do know if your amps or regulated or not? how loud do you usally listen to your music?