After reading up on old threads here to see what I needed I hit up a junk yard today looking for the relay junction and wires from the front to the rear for the brake controller.

https://www.ford-trucks.com/forums/1...g-harness.html

1994 F150 4x4 5.0/E4OD non factory towing package.

Years ago my father added a heavy duty hitch and flat 4 trailer plug. Now I will be towing a camper with brakes behind it a couple of times this summer.

At the junk yard I found a 1995 F350 crew cab LWB diesel that already had a lot of the good parts gone. But the relay block under the hood was still there and then I took the whole plug from the fire wall to the rear end off the truck.

After getting it home I started to clean it up and separate out the wires. I took my black plug that had a factory dust cap and plugged in the relay block. Plugged in the factory style harness and brake controller in and when I push buttons it lights up so I have power. The last thing to do is get the wiring to the rear of the truck.

After unwrapping the harness so I could clean the oil and dirt off the wiring I separated the brake controller part from the main harness. Then rolled up the rest of it out of the way and zip tied it.

It looks like I only need to plug in the grey connector to the junction box, splice in a black wire with orange stripe to the original factory harness in my truck and get the blue wire hooked up.

For the blue wire to be connected my options apear to be to pull my fire wall block and install that blue wire. OR just clip that wire from the current harness and use the current hole in the firewall for the manual oil pressure gauge to run the blue wire into the cab and splice it in to the new brake controller harness leaving the original factory wires under the dash alone.

I don’t want to use the whole used harness I got as it has a few bad spots for the tail light wiring and has extra wires for dual tanks, rear end speed sensor for the speedometer. Stuff I just don’t need. I will already have to trim some length off the brake controller wires in the rear. That will work out as I already have a univerisal style 7 pin bolted to the rear.

The relay jumpers I found were beat up and missing the dust cover. But being that was the only one there I will just have to keep a eye out for a better one later on.

Anyone else run those wires from the firewall back for the brake controller yet know for sure?

 

Does this help?

 

Thank you. When I get time later today I will go though them.

 

I have the towing package on mine, but I've changed up the engine harnesses so many times I've just left the external relay pack off.

But everything down stream is intact & original to the stock connector. (bumper)

I'm a re-pin guy, cut & splice only as a last or only resort.

Any question or image needed, just ask.

 

Agree with depin and repin, easy on these.

Please note, that you already have the cabin connector. I put a meter on the pins and some are already connected, I think it was brake pedal input and ground. Been a while since I checked on my '92.

Watching this as I plan to do the same for my 92. I have everything from the rear to fusebox.

Glad to provide pictures and such from my '96 F350 if they will help.

 

I will be back on it tomorrow so we shall see how it goes.

Only down side I seen to repinning just looking, looks like I may have to make a new hole in the plastic and I didn’t want to mess up my original one. But I am going to investigate further.

IF i splice in I will not do it to the harness under the dash. I will do it to the jumper wire that connects the factory plug to the brake controller.

 

The connectors have covers over them, that you unclip, slide up the wire, find what hole (blanks are numbered or count from the end) & drill.

Eight inch, I think

 

I got it done and it all works as it should.

On the firewall end. I plugged the grey connectors up. That left me with three wires. Blue wire.Black/purple stripe wire. Brown with orange stripe. I took my time and tried to take the F350 plug harness apart. I got it apart but it broke in several places. The plastic didn't feel in good shape when I started and that may of been why. But I decided I didn't want to risk my plug so I cut the wires from the F350 harness. I already have a manual oil pressure gauge so I used that existing hole to put the blue wire and the brown with orange stripe inside the truck cab. I used the blue splices that allow you to connect two wires side by side with out crimping them. I connected the blue wire to the new harness for the brake controller and supported that with small zipties. The brown wire with orange stripe I had to find the wire in the harness where it went though the fire wall and make sure it was also on the right pin hole according to the parts harness. Then I spliced it in the same way. That left the black wire with purple stripe. That wire I spliced in the same way under the hood.

I then got under the truck and ran the wires all the way out back routing them like factory with a small zip tie ever so often. Then took the time to put the factory split loom wire covers on them as well all the way to the end of the truck.

On the tail light end I had three wires. Large Blue. Large Orange. and (have to go look at the color again it's the back up light wire) I already had a plug in 4 pin to 7 pin adapter and since the original harness was on a crew cab LWB and was being used on a regular cab SWB I had some excess to trim off. I had considered just rolling up the extra length and getting the proper adapter but the factory plug had some damage on it. So I just used the universal adapter I already had mounted on the truck.

This has been tested with my camper hooked up to the truck and pulling it though the yard. Everything works as it should. It will be MAY before I get to give it a full road test.

 

Glad you had success & works as should.

 

you wouldn’t happen to know where the best place to get the pins for the plug would be or a p/n or style of the pins I would need to re pin the original c205 plug?

 

I don't. I've got spare pieces/parts of harnesses that I harvest.

Somebody has found them new, I just don't have a link. They have been posted here time to time.

Question is whether or not the co is still in business.