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First off, a link to, or just tell me what color the wire from the steering column to the back up lights is, and hopefully i can find out why i'm gettin no voltage from my otherwise good steering column harness.
Then, weirdly, my buddy is following me in my 1974 F350 automatic at night. He had the brights on the whole time, and after ten minutes on the highway, the headlghts went out for about a second, then on, then off, then on, for a couple minutes until i pulled over, since i thought he was signaling me to stop. We turned off the truck and lights, gave it a5 minute rest, he claims he smelled burning wires, but i did not. After the wait, he drove to my house, 5 minutes away with the lights on low beam only, and nothing out of the ordinary happened. The obvious question is WHY.
78 below.
Chilton manual 74-78
Maybe this will help, not mine, but from a fellow FTE member. Some more NSS and reverse light talk I saved from another FTE member. "When the trucks came with a manual trans, there was a dummy plug used to bypass the NSS switch. I've never been able to come up with a part number for the dummy plug. To bypass the automatic set up: Unplug the switch and discard or ignore. There are four wires in the harness plug, two each, red w/ blue trace and black w/ red trace. Run a jumper between the red/blue and red/blue, do the same for the black/red. That completely bypasses the NSS switch. Your truck will now start and the back-up lights will be permanently on.
Now on to the backup lights. In the engine compartment is a little U shaped jumper wire. It'll be located on the drivers side splash pan, just in front of the firewall where the wiring harness comes through. Unplug the little jumper, this will shut off the back up lights. There should be a back up light switch on the trans cover. Run two wires from the switch to the two wires that were jumped. This will get your back up lights working again.
Just a note, you could make a jumper plug out of the NSS. Cut the switch off the harness and splice the two pairs of wires. I just hate to cut these switches up. New, they're getting pricey. Here's the little jumper in the engine compartment. EDIT: If you don't care about the back up lights, just jumper the red w/ blue trace wires. This will by pass the NSS but the back up lights won't work."
FYI...Manual transmission NSS bypass jumper. The reverse lights are trigged from a switch on the side of the manual trans and have a different wiring harness.
I would bet that the issue with the lights is either a dimmer switch or a headlight switch is going bad. Make sure you do NOT have ANYTHING else tapped into the headlight wiring. That wiring is not the best place to tap into for/too power anything else on the truck.
So the neutral safety switch/back up light switch for an auto trans is on the top side of the steering column. Notice somthing missing on this one?
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