Hi Walter,
This post by Jarno had to sort out his body and running lights, also. It's a 1986 camper, but you should be close as far as the principle of the wiring. At the end of the post, he created a PDF file that shows him how the green wire, which is the wire for all the running lights, is connected. It may help you.
All lights but running lights
That said, this post may also help. It is a 1982 Sunline, and the owner had to sort out all the wiring.
Help with 1982 15’ TT
There is no wiring schematic for the campers on the DOT wiring, the wiring that the truck supplies power for. We do have one Sunline wiring diagram, but it is for a 2004 T2499 and deals with the 12 VDC inside the camper, not the DOT light that the truck 7-wire plugs actually power.
In order to sort yours out, you may have to start at the 7-wire truck plug and work backwards to every connection in the green wire circuit to find a short or where a wire may be unhooked—that 1982 camper post, Carla finally found how all the wire works when she found how the 7 wire truck plug ties into the inside of the camper. This is the pinout of the 7-wire plug
On your vintage camper, Sunline put glass fuses on the DOT lighting system. Does yours have a small fuse block like this with the glass fuses?
Starting at the 7-wire truck plug, the green wire comes from the truck plug to that fuse block. That is the 12 VDC power wire to power up all the running and body lights. Out of the green wire fuse block, that now green fused power wire goes to all the running and body lights. There is also a white wire, which is 12 VDC negative (ground), that also runs to all the running and body lights. Both the white and green have to be intact at each light fixture.
As shown in the wiring diagram in Jarno's post, the green and white wires jump from light to light. If one of these connections is loose, then the power downstream, either the green or white wire, will cause those lights not to work. Some of the campers, if they are long enough, may have a green wire junction spot in the camper, somewhere like Jarno's did. This is so they can wire power up the front and back part of the camper with shorter wire runs than jumping every single light from front to back. That junction might be mid camper.
Yes, this is going to be a search-and-hunt mission. And we do not know, or you do not either, if a prior owner changed something. The older camper has a black plastic wire loom cover, and the 7 wires were in that plastic cover. Along the way, that wire loom was replaced with a pre-molded 7-wire cable that went up into the camper.
I hope this helps.
Pictures and words about them also help.
John
