Actually the electric fuel pump draws next to nothing and beyond that I just have the ignition and the radiator fan is actually what draws the most... With that said I think I have is 63 amp or so alternator now and when I look at any of the other alternators 80 amp or a hundred amp the really don't come on and get that kind of amperage till your well over two or three grand... Tomorrow I should be getting a new yellow top optima battery which is a hybrid deep cycling... It seems like any heavy draws I occur are at low RPMs...