Hi, I have been thinking of installing a battery cut off switch on my Wildcat, 5th wheel. The problem I have is that the battery cover on my box comes off, so I can not install a switch on the cover. Can I install one on the away from the box, on the wall? How would I protect it & how would I insulate it? Would it be wired to the negative side of the battery? The reason I want the switch on the outside of the box is encase of a 12 volt fire, you have to disconnect the power to the battery. Looking for an answer.