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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

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Old 12-14-2014, 12:05 PM
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Smirks90 Smirks90 is offline
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Mystery wires on a mystery switch

so i have decided to change out a lot of the old wires in my truck and re run new ones. everything is back together. only a few issues. when i turn on my right blinker all the running lights flash. i think that is just a matter of tracing out which wire is not in the right place. but then there is the switch that is at the bottom of the steering column by the pedals. the switch changes position when you shift through park, reverse neutral and drive. there are 4 wires going to it and only 2 of them are hooked up. what is this switch for and what does it tie into. any ideas? thanks
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Old 12-14-2014, 12:15 PM
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Sounds like something wired wrong on the lights, feedback going on. I have actually seen that happen from a burned out bulb when one element touched the other. The switch you speak of is the neutral start and backup light switch. If the neutral start is functioning then the back up lights are not plugged in.
Unless you've been attacking the under dash wiring, I'd start from the back of the truck because of old trailer wiring, pertified wires and repairs in that area, it is most often the cause of malfunctions will begin in that area.
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Old 12-14-2014, 08:20 PM
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Ok so I figured it out. The bad blinker issue was terrible wiring done by the previous owner that fed the tail lights. The other issue was the backup light switch was not engaging. I took that switch apart and rebuilt it now everything is working as it should. Thank you for your advise.
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Old 12-14-2014, 08:57 PM
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The NSS (Neutral Safety Switch) is located towards the bottom of the steering column, also controls the backup lamps. It's the same, 1967/77 F100/350: C7TZ-7A247-A (Motorcraft SW-600).

The NSS selector lever (D0TZ-7B097-B replaced C5TZ-7B097-A) fits onto the shift tube thru a hole in the steering column shroud, its knife blade end fits into the NSS

What happens to it: It loses tensile strength and falls off the tube, or its knife blade end snaps off. When either occurs, the truck can be started in any gear. Not pleasant!

The selector lever is the same 1965/77 F100/350, it's obsolete, but 100's are available NOS
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