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Customs Neutral safety switch wiring diagram

Discussion in 'The Hokey Ass Message Board' started by olds vroom, May 8, 2021.

  1. olds vroom
    Joined: Jan 29, 2010
    Posts: 984

    olds vroom
    Member

    Hello all , My father-in-law just purchased this truck. It has a lot of small things wrong with it and as he is 80 it’s become my project to fix this truck . It has a 88-94 chassis under it and the column from that donor truck as well . I’m trying to find a wiring diagram for the neutral safety switch so I can gat the back up lights working. Would anybody here this or just know it? IMG_0615.JPG


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  2. squirrel
    Joined: Sep 23, 2004
    Posts: 49,802

    squirrel
    Member

    purple is the start circuit, light green is the back up light circuit.

    But I really have no idea what wires are in the truck. Might help to have more info, perhaps a picture of the switch in question.

    btw 1966 was the first year that back up lights were standard equipment. And this is a pre-65 forum :)
     
  3. David Gersic
    Joined: Feb 15, 2015
    Posts: 2,434

    David Gersic
    Member
    from DeKalb, IL

    If it has a GM column in it, you may find the switch at the bottom of the column. Looks like this one

    https://www.ididitinc.com/ft-3078-tech-tips.html

    It may be missing, bypassed, or replaced by something else, depending on who assembled whatever it is that you have there.

    Good luck. May not want to mention that it’s a post-1964 chassis.



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  4. olds vroom
    Joined: Jan 29, 2010
    Posts: 984

    olds vroom
    Member

    Squirrel , it’s the same truck 60-66 with the exception of the backup lights.


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  5. squirrel
    Joined: Sep 23, 2004
    Posts: 49,802

    squirrel
    Member

    I know that....

    Do you have more info about the wiring in the truck, and a picture of the switch?
     
  6. Mr48chev
    Joined: Dec 28, 2007
    Posts: 30,027

    Mr48chev
    ALLIANCE MEMBER

    This is an 88/94 C1500 neutral safety switch 2 pins are the neutral safety 2 pins are the back up lights the 5th pin evidently goes with the range finder what ever that is . Unless they changed wiring or hacked up the wiring there should be two plugs with two connectors or one plug with four connectors close to where that switch is on the column. meaning you may have to swap connectors to hook it up. Better job for a younger limber guy than an older not very limber guy. NS-41_Front__ra_p.jpg
     
  7. Happydaze
    Joined: Aug 21, 2009
    Posts: 1,173

    Happydaze
    ALLIANCE MEMBER

    And don't forget to use the correct gauge wire as the starter solenoid takes quite a bit of power. Don't ask me how I know this.

    Chris
     
  8. Neutral safety switch wiring is simple. It goes in-line in the wire from the starter terminal on the ignition switch to the starter wire terminal on the solenoid. 2 terminals. Like a brake light switch, doesn't matter which is which. Wire runs from starter terminal to one of the terminals on the neutral safety switch. Wire from the other terminal on the NSS goes to the S terminal on the starter solenoid.
     

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