Part ID?
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Junior User
Joined: Apr 2009
Posts: 60
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From: NW Gerogia
Part ID?
I have a 1973 F100 (302 / Automatic) I am working on rewiring, I removed the complete wiring harness due to the P.O. who ever so kindly melted it. I am replacing it with a complete harness out of a 1978 F100 but there is a plug that I cannot identify on the '73. It is on the steering column near the firewall inside the cab, it looks to be a spring loaded switch with 4 wires coming out of it to a 4 pin wire flat plug that looks identical to a trailer wiring plug. Any help with what this is because the harness from the '78 does not have anything to plug back into this? Thanks.
Laughing Gas
Joined: Jul 2012
Posts: 1,123
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From: Southern Illinois
I wouldn't have a clue because I dont know hardly anything about wiring except how to hook up a sound system. What I do know is that pics will definitely make things easier for the guys who do know what they are talking about to identify.
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Junior User
Joined: Apr 2009
Posts: 60
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From: NW Gerogia
I think I have figured it out. It seems to be the neutral safety switch, how would I go about splicing this into the '78 harness b/c I would assume the '78 had the switch on the transmission itself?
Hotshot
Joined: Apr 2009
Posts: 14,333
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From: Stanley, VA
You are correct, that's the NSS. The '78 harness should have a gray, square connector with four wires going to it, white w/ pink trace, black w/ red trace and two red w/ blue trace.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
1973/77 F100/350: The NSS is located on the steering column (C7TZ-7A247-A / Motorcraft SW-600). Same I-6 & V8.
1978/79 F100/350: The NSS is located on the trans. C6 (D8TZ-7A247-A / Motorcraft SW-1489) uses a different NSS than a C4 (D8TZ-7A247-B / Motorcraft SW-1491).
1978/79 F100/350: The NSS is located on the trans. C6 (D8TZ-7A247-A / Motorcraft SW-1489) uses a different NSS than a C4 (D8TZ-7A247-B / Motorcraft SW-1491).
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