No Neutral Safety Switch?
Thread Starter
|
5th Wheeling
Joined: Sep 2020
Posts: 38
Likes: 0
No Neutral Safety Switch?
Hi - Can anybody tell me whether the 1967 F600 came with a neutral safety switch? My 4-speed manual NP 435 Tranny has the switch on it, but I cannot find any race of wiring for it. Maybe this tranny was swapped out at some time? If the truck did come with a switch originally, can someone tell me what color wire I should be looking for in the harnesses between the ignition switch and the starter solenoid? Thanks.
Super Moderator
Joined: Apr 2004
Posts: 34,499
Likes: 2,811
No NSS in that year on a manual transmission.
Your wires should be for backup lights. Or it's a much later transmission, a Transmission Regulated Spark switch. The input shaft for pickup transmissions is smaller than for the medium truck. Is this in the truck or are you installing it?
Illustration:
NP435 Question w/pics - The FORDification.com Forums
Your wires should be for backup lights. Or it's a much later transmission, a Transmission Regulated Spark switch. The input shaft for pickup transmissions is smaller than for the medium truck. Is this in the truck or are you installing it?
Illustration:
NP435 Question w/pics - The FORDification.com Forums
Thread Starter
|
5th Wheeling
Joined: Sep 2020
Posts: 38
Likes: 0
Bought the truck with the tranny in it. As I understand it, the F600 did not come with backup lights until 1969. The prior owner botched a bunch of wiring in this thing and I'm trying to get the electrical back to original condition. I cannot find wiring for the NSS, so I must assume that this was a replacement transmission, unless the switch is for backup lights. The switch is on top of the tranny, drivers' side, just rear of the shift ball. It is a 1" hex stub with a large ball bearding inside and two connectors on the outside. The switch works but shows about 3 ohms resistance, which seems high, so maybe it's no good. Do you think this could be for backup lights?
Cross-Country
Joined: Apr 2022
Posts: 61
Likes: 17
Take an ohm meter and put the tranny in reverse, probe the terminals on the switch in "Ohm" setting, if the VOM reads Zero, or something close, take the tranny out of reverse and check again. If the reading is "OL", on a Fluke, or maybe "OPEN" on other brands, you have a Backup light switch. My '66 700 has a NSS, but I am an Allison auto tranny so it is expected. Odd note, built in to the NSS is a set of leads for Backup lights BUT the truck makes NO provision in the rear harness for them, WTF Ford?
Super Moderator
Joined: Apr 2004
Posts: 34,499
Likes: 2,811
Clutch safety switches started in the '80s IIRC.
Trending Topics
Thread Starter
|
5th Wheeling
Joined: Sep 2020
Posts: 38
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
Bought the truck with the tranny in it. As I understand it, the F600 did not come with backup lights until 1969. The prior owner botched a bunch of wiring in this thing and I'm trying to get the electrical back to original condition. I cannot find wiring for the NSS, so I must assume that this was a replacement transmission, unless the switch is for backup lights. The switch is on top of the tranny, drivers' side, just rear of the shift ball. It is a 1" hex stub with a large ball bearding inside and two connectors on the outside. The switch works but shows about 3 ohms resistance, which seems high, so maybe it's no good. Do you think this could be for backup lights?
Super Moderator
Joined: Apr 2004
Posts: 34,499
Likes: 2,811
Two speed shifters are on the stick, or the dash. We are talking about the switch on the top cover of the transmission as shown in the illustration in post 2. You have to scroll down in that illustration to see the factory drawing of the top of the transmission.
Also with respect to back up lights: The NP435 was used in pickups which at some point came with back up lights as optional or standard equipment. It was also used by other makers, again in pickups or other vehicles that left the factories with bodywork.
An F600 was/is almost always sold as a chassis/cab, with temporary brake/tail lights. Whoever installs the back of cab equipment would install backup lights.
Also with respect to back up lights: The NP435 was used in pickups which at some point came with back up lights as optional or standard equipment. It was also used by other makers, again in pickups or other vehicles that left the factories with bodywork.
An F600 was/is almost always sold as a chassis/cab, with temporary brake/tail lights. Whoever installs the back of cab equipment would install backup lights.
Thread
Thread Starter
Forum
Replies
Last Post
84F150driver
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
10
Jun 14, 2010 09:14 PM