Can someone please explain to me how do you wire a second battery??? I just picked up a 6 Channel JL Audio Amp. and I want to run a second battery. How do I wire this. Is it power cable to the new battery and ground, or new battery to battery one {Positive to Positve/Negitive to Negitive} running the power cable to battery two or lastly Run both positive wires to the alt and both negetives to the same ground??? I've done all the other speaker and wire connections. This is just my last step and now I''m stuck.