The trailer only has one bulb that is uses for both functions. Why does it have five wires and not four? Its because the truck uses two bulbs for your brake and turn lamps. The old white box you have is a trailer light converter. I was hoping to un-plug the old connection with the spliced wire and replace it with new piece, (simple fix, right?) but realized I cannot do that. Top right: 4/5 wires (brown, red, white, yellow) are connecting behind panel on driver's side?īottom right: new part I ordered off amazon. (don't understand why there is 5 on a 4 pin hook up?)īottom left: 5 wires coming up through the driver's side floor, green one goes to the passenger side? Top Left: 'Problem' - 5 wires, brown one is cut. Maybe I haven't searched and found the right thread and/or one thread had missing pictures 'cause it was so old.Īnyways, I want to replace/fix my 4 pin trailer wiring. i can get pics for you if you want or need. on the portion that is outside the truck i doubled the loom(1/2' over 3/8') and again used silicon tape at the ends -about 6' up the line to keep things weather resistant. then wrapped it in 3/8' loom and silicon self sealing tape. i made sure my splices were inside the vehicle and i used di-electric grease on all of them along with two layers of heat shrink. so i wanted a good connection and conduction, and so i replaced it.

i swapped mine out cause the dust cover wouldnt stay on anymore, and the sheathing/isolation on the wires was getting old and brittle, and starting to crack.

i just went down to napa auto parts and bought a vehicle side kit, and cut and spliced it into my factory harness. hope that helps let me know if you have any more questions. brown is your brake/tail, white is your ground green is your right turn, yellow is your left turn. So there are 5 wires because, you have a brake light, a running light, left turn signal, right turn signal, and ground. I guess i should of done a write up on this when i did this a couple of weeks ago.

4 pin trailer connector with 5 wires