Tenscourts,
I read your post about your dual battery setup, but I'd like to understand how your particular setup operates. If I understood correctly, you are running loads off the second battery, but that those loads are only powered when RAP is on. If that's the case, you can't power the OEM loads with the second battery (such as radio), and you have to have the key on to run the second battery loads. Wouldn't this be draining each battery (aux loads on second, RAP loads on main)? It would be great if you could post how you're using your setup, and a sketch would be helpful as well.