Hmmm, I'm going to keep looking into this. Maybe I don't need the switch. I do like the idea of the switch for the "combine" idea, with respect to the Blue Sea option.

Tay,

Yeah, you remove power completely when you go to off. You could wire the stereo 12V constant wire directly to the battery. But, then you defeat the purpose of the switch being put in the "Off" position because the stereo is going to drain the battery slowly.