I'm working on a 63 Overlander and having trouble with the 12V
wiring. The umbilical cord is spliced into the trailer wiring underneath at the front right. From this space lead a number of red wires. One is left turn/stop, one is right turn/stop, one is (I believe) tail and clearance lights, although I can't get any continuity through it. There is also a pair of wires (one black, one white) which I think leads to the brakes but haven't checked it yet.
What I'm having difficulty understanding is the remaining two wires, which are heavy gauge - one red, one green. There is continuity from the red wire here to the pair of red wires that terminate at the battery compartment on the left side of the trailer just behind the furnace compartment. There is also continuity between this wire and the trailer skin. I cannot find continuity between the heavy gauge green wire and anything.
Someone has worked on this stuff before, because in the splicing space up frong I found the remains of a circuit breaker which had once been connected between the orange wire and a blue one (which no longer seems to be there).
At first I thought that perhaps the trailer was originally wired for positive ground, but since I can't figure out how the green wire would come into the equation, I'm now inclined to think that the hot red wire has been adapted to ground somewhere, and the original ground is open somewhere.
I can't find any access to the wiring other than at the access panel underneath, and at the battery compartment. I've checked behind and under the gaucho and along the walls between these two locations.
Any ideas/suggestions would be very welcome!