Tail light plug wire identificarion
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Mountain Pass
Joined: Dec 2021
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Tail light plug wire identificarion
78 f150 429 (orig 351m) 4 spd 4x4: ended up replacing the entire section of wire from the connector on front left apron all the way back. There are actually two green plugs. One larger (C306) and one smaller green connector (unsure of ident). The smaller connector has two brown wires coming out. I traced one back to the taillight wiring, but the second one was just cut and hanging there. Wondering if that went to fuel solenoid? Which I don’t have. The end of that plug was just laying on the frame rail. Wondering if anyone has a diagram showing wiring from both plugs? On the larger plug, yellow/b, green, red/b go back to tail lights. Green/R is fuel gauge. But there’s a few other wires that I have no clue where they go….. a light blue wire?? Any input on the colors of the original wires coming out of both plugs and there end points would be awesome. Tried following fordication schematic but just can’t seem to get a good handle on wiring diagrams
rhanks
rhanks
FTE Legend
Joined: Nov 2015
Posts: 30,906
Likes: 4,122
From: Angier, NC
I dont have a truck of your year (81 F100) but on something like this I would use a test light to check what each wire dose.
You say you have the fuel gauge with the key on and test light it should blink if it is the gauge wire.
Now going to the rear you should have
Right turn / brake
Left turn / brake
Running light
Back up light
and the fuel makes 5 wires how many do you have?
Now up by the transmission I have a plug with 2 wires and it goes to the bark up light switch on the manual transmission.
On yours I dont know if it would come from the frame rail or firewall over the top of the transmission?
I also have dual tanks so I have a second fuel gauge wire and a tank switching valve wire as part of the harness going to the rear.
Dave ----
You say you have the fuel gauge with the key on and test light it should blink if it is the gauge wire.
Now going to the rear you should have
Right turn / brake
Left turn / brake
Running light
Back up light
and the fuel makes 5 wires how many do you have?
Now up by the transmission I have a plug with 2 wires and it goes to the bark up light switch on the manual transmission.
On yours I dont know if it would come from the frame rail or firewall over the top of the transmission?
I also have dual tanks so I have a second fuel gauge wire and a tank switching valve wire as part of the harness going to the rear.
Dave ----
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