Old 60's TT tow lights Wiring Question, HELP!!!

So i am at a loss here. I am trying to hook up my old travel trailer for towing running lights and such, there is already preexisting wiring, but all the teardrop lights are burnt and rusted. So i got new ones.

So basically, i have 6 wires coming off the harness. White, Blue, Black, Yellow, Green, And the last one looks Brown/orange/red. So old hard to tell. The Brown(/red/orange), yellow, black, green. all shoot up into the siding. The white and the blue go back to the brakes. I Found the black is the 12v wiring and it works. but i cannot get any of the other lights to work. I am at a loss. tried everything. I see no white ground that grounds out the trailer, only white wire i see goes to the brakes.
I figured if i can get the 12v to work in the camper than the wiring for the lights cant be completely messed up and i'm just missing something.
What am i missing here. i am so stumped we are about to rip the siding in the back and front off and just run simple new wiring for running lights and brakes. But i would like to have all lights working without having to do that.

I'm open to suggestions and help.