61 Overlander Wiring help please

[mgcarma]

Ok, so I have most of the wiring sorted.
I found a "Honda civic" Napa battery that fits nicely in the front battery box.
Here is the problem. I have a green wire (ground), and two orange wires.
Both are heavy gauge and one of the orange wires services all of the 12v needs inside the Airstream.

I have a second orange wire that I have no idea what it does. (I have a guess). When I opened the inspection holes behind the gaucho, the street side has the termination of this orange wire. It is in a pair with a green (ground) wire. The orange wire ends and marries up with a wire that disappears down the street side chassis member, it has a jacketed wire with two wires inside of it, one red, one gray. I believe this may be for the trailer brakes.

Can someone please confirm that this is what these wires are for? I can get the test light out and see what I get, but I am sure that someone on this forum has had that inspection box open and knows what that second orange wire is for.

Any help much appreciated and I can provide pics of what I am talking about when I get home after work tomorrow.

Thanks
Kevin

[mgcarma]

Ok, so here we have pics of steetside (Orange wire splitting into a gray and red wire and disappearing under the trailer) and curbside (blue wire splitting into yellow and red and also disappearing under trailer) are these the wires to the trailer brakes?
Thanks
Kevin