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Neutral Saftey Switch

Discussion in 'Retro-Fit & Aftermarket Accessories' started by Zoomalot, Aug 12, 2017.

  1. Zoomalot

    Zoomalot Full Access Member

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    Location:
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    First Name:
    Randy
    Truck Year:
    1987
    Truck Model:
    Silverado Shorty
    Engine Size:
    350 Ram Jet
    Need to install Neutral Safety Switch on "87" to pass Canadian Inspection
    Auto to Super T-10 any suggestions on which wires would be appreciated


    IMG_4117.JPG
     
    Honky Kong jr likes this.
  2. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Truck Year:
    87
    Truck Model:
    V10
    Engine Size:
    Lil BB 407
    Find the clutch pedal switch at a yard and run your automatic neutral safety switch wires threw it. That's how the factory did it threw the clutch pedal. And very nice truck you got there and welcome to the site.
     
  3. 74 Shortbed

    74 Shortbed Full Access Member

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    Welcome to the site, very nice truck indeed..
     
  4. chengny

    chengny Full Access Member

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    Location:
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    First Name:
    Jerry
    Truck Year:
    1986
    Truck Model:
    K3500
    Engine Size:
    350/5.7
    By 1987 the neutral safety switch (formerly used with automatic transmissions) was history - 1984 was the last year I think.

    It was replaced with a mechanical interlock in the column that prevented the ignition lock from being turned to the START position unless the gearshift was in P/N. The combination NSS/BU light switch became just a BU light switch. The NSS contacts -and the wiring that connected them - were eliminated from the harness.

    On the other hand, trucks equipped with a manual transmission continued to be fitted with the "clutch start interlock" switch. But seeing as your truck came out of the factory with an A/T, that switch and the associated wiring won't be there.

    So, since you won't find wiring for either a CSS or a NSS in your truck, you will need to splice a CSS into the lead that runs from the ignition switch to the starter solenoid. For trucks originally equipped with an A/T - and from MY 1985 and up - there is a purple wire that runs straight from the ignition to the solenoid.

    So, after you source a clutch safety switch (and find a way to actuate it with the clutch pedal) all you have to do is cut the purple lead and insert the CSS wiring/switch.

    The PPL 6 circuit (one wire) will be in the bundle with a yellow tracer:

    BHPIM1689 (15).jpg


    I'm severely color deficient but, going by it's location on the ignition switch, I am fairly certain the yellow arrow is pointing to the wire you need to splice the new CSS into.

    This image shows it better (disregard the yellow circle and line):

    HPIM2546.jpg

    A wiring diagram of what needs to be done:

    start charge.JPG
     
  5. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    My 87 has a switch at the base of the column for the reverse lights and I was assuming the green wires were for the neutral safety switch....I ran the reverse light wires threw my floor shifter and left the others alone. A clutch pedal switch could be added to interrupt the starter lead from the ignition switch inside and activate it when the pedal is pressed. It's not fancy but effective.
     
  6. Zoomalot

    Zoomalot Full Access Member

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    First Name:
    Randy
    Truck Year:
    1987
    Truck Model:
    Silverado Shorty
    Engine Size:
    350 Ram Jet
    Thanks for the informative reply
    I think I will spend time on this forum
    I do NOT know everything and gobble up knowledge about CHEVY anything, and am willing to advance the knowledge to others.
    This is my 2nd square body, my first one I had for 28 yrs.
    Thanks again
    Zoomalot
     

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