the battery turns the starter over on the jetski and powers a ****ing coil , thats it. maybe like 3 amps draw once its cranked up. your amp draws more than that with no volume and no speakers hooked up. dude you are a ****ing retard and you dont deserve the equipment you have and soon it will repay you for your dumb-***-ed-ness by blowing up in your face. hopefully starting a fire and burning your little shitmobile to the ground. one can only hope after that happens that you will listen to someone when they give you advice the next time.