Im getting ready to install the amps for tower speakers and subwoofer. I think i'm on the right track i"m just unsure of where to hook the power wire. The battery switch has 1 hooked to battery 1. 2 to the helm power and power wire from the engine. 1+2 is hooked to battery 2. I confirmed in the manual it is supposed to be this way. I'm confused. Any advise?