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I was hoping someone might have an idea as to what these two wires and plug go to. I've searched FTE and looked in my wiring diagrams, but no luck. It's on the passenger side in the A/C harness that comes through the lower part of the firewall. It's in the same harness as the wires that go to the pressure switch on the accumulator. Both wires are solid yellow.
Thanks in advance.
Solid yellow wires in that area are usually hot all the time feed wires from the battery + power. Has anyone done any re-wiring? If they are the power wires I am thinking of, you would have a lot of things not working.
This harness came out of a nice 1986 F250 Super cab with a 460, auto, and 4x4 that I found in a junkyard. Before I installed this harness I looked over it extensively and surprisingly no one had hacked it up or spliced anything. I should have traced it out before I installed the harness in the truck, but I just assumed it was A/C related since it was in that section of harness. Of course now I'm working on hooking up the A/C and there it hangs. So far I've just used a test light, but it doesn't seem to have any power on it with key on or off.
@thunderguns71
Don't know what they are for but on my '86 5.0L they plug into this connector. Wires appear to be tan/black, tan/brown. Those wires disappear into the harness that runs across the front of the engine.
Edit: those two wires are bundled with one wire that lands at the AC pressure switch. AC clutch relay or relay solenoid power?
I dont remember that wire / connector on my 81 F100 with factory AC but it also has been a year or 2 since I messed with the wiring.
Idont know if it was for our year trucks but some AC systems also had a high limit switch could that be for it?
On my truck the compressor wire IIRC come from the harness to the low PSI switch to the compressor and a wire teed off to a solenoid on the carb to bump the idle up when the AC / compressor is powered up.
Dave ----
@thunderguns71
Don't know what they are for but on my '86 5.0L they plug into this connector. Wires appear to be tan/black, tan/brown. Those wires disappear into the harness that runs across the front of the engine.
Edit: those two wires are bundled with one wire that lands at the AC pressure switch. AC clutch relay or relay solenoid power?
I am thinking those wires are really a faded pink/black. And the connector is C119. It is used in various configurations for the fuel pump relay power and the inertia switch. Thanks to the conversation in this thread, I think we have figured it out somewhat.
Here is your 5.0 EFI with the c119 connector with the two yellow wires and the pink/black wires.
Here is the same C119 connector in the 460 configuration. Again, Ford is using bits and pieces of the harness universally for different engine configurations.
So curiosity got the better of me and I went to the junkyard today. I found three trucks, an 84 and a couple 86s with the same two yellow wires. On all three trucks they plugged into a socket with a yellow and what looked like a pink wire, but could have been faded red. Anyways they ran along the passenger side fender up to the core support and then crossed over the core support to the driver's side fender where they then ran to a relay on the driver side firewall right next to the fender. Then from the relay into the main harness. So while I still don't know it's function at least know where it goes now and it doesn't look like I need it.
So curiosity got the better of me and I went to the junkyard today. I found three trucks, an 84 and a couple 86s with the same two yellow wires. On all three trucks they plugged into a socket with a yellow and what looked like a pink wire, but could have been faded red. Anyways they ran along the passenger side fender up to the core support and then crossed over the core support to the driver's side fender where they then ran to a relay on the driver side firewall right next to the fender. Then from the relay into the main harness. So while I still don't know it's function at least know where it goes now and it doesn't look like I need it.
I guess you didn't believe me? That relay you ran into in the junkyard is the fuel pump relay. The previous diagrams show that. And it IS a pink/black wire, just like the diagrams show above.
And the Inertia Switch could easily be left out of the circuit by simply splicing the two Pnk/Blk wires.
The two yellow wires are coming through the firewall near where the Inertia Switch is located.
I guess you didn't believe me? That relay you ran into in the junkyard is the fuel pump relay. The previous diagrams show that. And it IS a pink/black wire, just like the diagrams show above.
I believed you and I appreciated the diagrams. I had to go pull some more parts and while I was there I was curious how exactly they ran/routed the harness since I have none of that in my truck.
I believed you and I appreciated the diagrams. I had to go pull some more parts and while I was there I was curious how exactly they ran/routed the harness since I have none of that in my truck.
Sorry, that's true. The diagram shows how it's hooked up but doesn't show the locations very well.
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