hey my dad is flatly refusing me to wire up a 240w amp cos (just my luck) he was watchin a tv program earlier on with a guy with a SUBMARINE battery powering his ICE! so now he thinks therel be too much drain, the batterys new but has been drained as the alternator bust, but i fitted a new one and its been fine ever since! but its his car so if he wants to be paranoid i can only prove that the amp is not a great drain on the car and it wont stop with lights and radio on etc.. i know an amp will drain a battery fast if the engine is off but it should be ok? ive an alpine 4x45w head, cd changer, standard ford fronts (this is in my fiesta by the way!) and alpine 90w 6x9s, am i safe to run all this?