I have a 76 westy, and am thinking about finally getting my other battery
working again (i.e. getting a new deep cycle in there).  What I need to
know is if anyone knows how to wire that box that goes between the regular
battery and it.  I'm assuming that box is a relay of some sort, but the way
it was hooked up didn't seem to provide any charge anywhere, and random
changes produce the occaisonal "click" but still no useful charges as far
as I can tell.

Thanks,
Eric