You should be able to find a good quality battery switch at a marine supply store, or maybe even Walmart. It's a common item on boats and wireing is very simple, hot lead in, feed line out. It can be mounted almost anywhere.
1951 Chevy 3600, 1996 Yukon, 2000 Road King It is easy to take liberty for granted, when you have never had it taken from you. http://www.stovebolt.com/gallery.htm
