Ok here is my deal, i have a yellow top optima and a red top in my truck. I am trying to figure out how to wire them together. I want to isolate them from each other so I can run the yellow top down w/ lights, winch, etc. and still have the red top to start the truck. Whats the best way to do this? I don't really want to get into doing one of the isolator kits ($$$). I am thinking about running a marine battery stiwch like this one If I do do that there are 3 places to hook up wires on it. What should I put where? Do I need a switch that beefy? Thanks!