Looking for a wiring diagram for the rear tail light harness. New harness comes without plug,so I have to splice it together. Hopefully the wires match up🤞

 

Taillight wiring on the right side of the diagram

 

It is not that hard to figure out the wires with a test light and a quick touch of wires.
You should have think 4 or 5 wires running down the frame that get hooked to the tail.
left turn / brake light
Right turn / brake light
running light
Back up light
and maybe a ground as my 81 flare side did not have a ground wire as prat of the harness.

When you find what wire dose what on the truck side just touch that wire to one of the tail light harness to see if it lights the right bulb and the right part of that bulb.
When doing this make sure the tail light harness has a ground or the bulbs will not work. Ask how I know

BTW I had to take a style side tail light harness and make it into a flare side tail light harness.
Style side harness

What was removed from the style side harness

What I ended up with. My light housings have plugs that plug into this new tail light harness.

I also had to make a plate light harness that plugs into the above harness.

All of the above harnesses is like factory with plugs where they should be.
I also have a trailer wire harness that has a Tee pig tail (seen in first picture wrapped around the hitch) that plugs between the trucks harness and the tail light harness that is then wired into the trailer plug.

Dave ----

 

BTW if you dont have the factory plugs on either harness I seen male / female pig tail plugs with different numbers of wires at NAPA that you can splice onto the harnesses.
This way if you want to remove the bed you can just unplug the trucks harness from the tail light harness and leave the lights on the bed.
Dave ----

 

Be sure to NOT use those infernal Scotch-Locks.

 

I am planning a re-wire on the back of my truck. It has a dump bed with aftermarket tail/brake lights, add-on reverse lighting, a 4 prong trailer plug, a 6 prong trailer plug, and a 7 prong trailer plug. All this is joined together in a wiring knot tied to the frame.

I am going to go up the frame rail a short distance, and cut the lighting wires. I will keep the reverse light wire and the trailer brake wire and extend them if I need to. I am going to convert the factory lighting wiring to trailer color code, white, brown, yellow, and green and neatly splice it to the factory wires.

I have a plastic box I bought at Lowes. I am going to mount it to the rear frame rail, and put a large hole in the bottom with a strain relief connector. ALL the wires will go into and out of this box. Wires from all the lights, wires coming from the truck, wires coming from the 4 prong, the 6 prong and the 7 prong trailer connectors. ALL the wires will come into the box. They will all then be spliced together there. All the lighting wires will simply be hooking all the yellows together, all the greens together, all the whites together, all the browns together. Then all the blues for the trailer brakes, and 2 or 3 reverse light wires. The connector and the wires will come and go out of the bottom of the box so it does not collect water.

All the connections will be jambed back into the box and the lid installed.

 

Dave just wire in the 7 pin trailer pug and get adapters for the 4 & 6 that plug into the 7.
I have 2 tucks wired with 7 pin and each truck has a 7 to 4 adapter. 1 was fom the factory other i bought.
If you trailer has a 6 pin cut it off and go with the 7 pin.
So much easier that way.
Dave ----

 

I'm with Dave G on this. Junction boxes aren't meant for automotive applications. Just use good butt connectors and seal each connection with shrink tube (using larger pieces for assemblies, if you'd like). It'll be easier to manage and maintain.

 

If you want to start with something that is plug and play, check this out:
W/ Trailer 80-96 Ford Truck Tail Light Harness Bronco, F150, F250, F350 | mrtaillight.com