Compatible Wiring
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Freshman User
Joined: Sep 2009
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Compatible Wiring
I have a 76 I need to completely re-wire. What years are compatible? I bought a 78 for this exact reason with all the option mine had, but the freakin wiring harness is different. What years WILL work? Or, will the 78 wiring work with modifications?
Oh yea, F-250.
Oh yea, F-250.
Senior User
Joined: Jun 2009
Posts: 329
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I replaced the wiring from my 77 F100 with the entire harness from a 75 F100. There were a few differences, but nothing to serious. Had to use the 75 ignition switch, the 75 ignition module, brake light wire was in a different spot, and the front directionals were a different plug. I changed the entire harness and left the tail light wiring. Takes alittle time but better than chasing all the cut wires that were in my truck. Good luck.
Thread Starter
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Freshman User
Joined: Sep 2009
Posts: 46
Likes: 0
I replaced the wiring from my 77 F100 with the entire harness from a 75 F100. There were a few differences, but nothing to serious. Had to use the 75 ignition switch, the 75 ignition module, brake light wire was in a different spot, and the front directionals were a different plug. I changed the entire harness and left the tail light wiring. Takes alittle time but better than chasing all the cut wires that were in my truck. Good luck.
What has me worried, is the harness appears to plug into the drivers kick panel on the 78 whereas it does not on my 76. Anybody know what that plug is and why it is there?
Senior User
Joined: Jun 2009
Posts: 329
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That is exactly what I did. I had both trucks and took what i needed. There was a green plastic plug into the drivers side frame that I believe was for seat belt buzzer. The 77 had it and the 75 did not. I removed it and no issues. Didn't really plug into the side, more of a push in pin.
