I had a yellowtop under the hood, and the big 3 in my old car with a 130 amp alt. I was running to old SVC Punch P2 12's on an AQ750. Electrical wasn't much of an issue. My buddy's jeep had an XS under the hood and a D3400 in the back with the big 3 and a 270 amp HO alt. He bought a second battery for the back, and now the AQ doesn't have any problems. The electrical should have been fine with both setups. But again, I'm not bashing AQ, I've just had bad luck with em.