I just looked at the factory wiring closer. My amp is hooked up in series I guess off of that black box, where the stock positive wire goes. Should I upgrade the wire from battery to block, or just run the power wire off of the battery. I'm not sure if they left enough wire to reach. But my fuse is right there so it shouldn't be to hard to put in a new wire. I also noticed the ground comng off of the battery is larger in diameter than the positive???? Where is the engine ground wire attached? chris