LS to 96+ wiring info

Discussion in 'LSX + Carb Swaps' started by DRAGGIN95, Dec 15, 2011.

  1. DRAGGIN95

    DRAGGIN95 Warranty Killer! Staff Member

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    I found this and thought it would useful
    Obs to Lsx wiring made simple
    Ok so if any of you guys have been keeping up with my build its been a long road. But i have found the easiest way to run the wiring for the ls engine into a 96+ Truck. This will only work in those trucks. what i have found is that you can remove the pins from your factory harness and install them right into the ls harness and pcm. that way you will be using the OBS fuel pump relay, VSS signal, Check Engine light, and brake signal.

    basically if you decide to do your own harness or have one made you will remove from the green connector completely

    9 - Fuel Pump

    46-Check Engine

    16-4wd low (4wd only)

    blue connector

    33- brake signal

    then from your stock obs harness you will remove the following pins and insert them directly into the ls harness

    Black connector plug

    1 fuel pump

    5 Check engine

    10 Brake signal

    23 4wd low (4wd only)

    this saves you from having to cust and splice wires and makes for a seamless integration. as far as the starter you can reuse the factory PNS switch and obs solenoid wire which should be purple.

    the other connections from the harness like ignition and constant power should be pretty straight forward. ​


     
  2. olblue97

    olblue97 I'm Awesome

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    So this works if your using the factory ls1 harness?
     
  3. DRAGGIN95

    DRAGGIN95 Warranty Killer! Staff Member

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    Yeah or a modded truck ls harness, these could also be added to an aftermarket harness such as a nelson harness for a more oe look.
     
  4. 1996*GMC*SHORTBED

    1996*GMC*SHORTBED I'm Awesome

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    Good info. Speaking of the PNS switch on a '96(& up) pickup, where is it? And is one needed to make the inside column indicator light up & work? Wire color? thanks
     
  5. LSXTOMMY

    LSXTOMMY Newbie

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    Heck ya good info thank you this will help tremendously
     
  6. 95SUBURBANLM7

    95SUBURBANLM7 OBS Enthusiast

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    So if I'm reading this correctly, and Id like to think I am, it looks like it is much easier to swap an LS into a '96+ GMT400. I really wish I had seen this before I spent the time to mod my '95 harness. With that said, how doable is swapping a '96+ harness into my '95? I know the C100 is the same, so its just a matter of repining it. Right?

    Any help would be appreciated.
     
    Last edited: Apr 22, 2016
  7. 95SUBURBANLM7

    95SUBURBANLM7 OBS Enthusiast

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    Anyone?
     
  8. Epicsniper145

    Epicsniper145 Newbie

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    What about all the other guages can you do the same thing. Oil pressure voltage engine temp stuff like that. Or how does that stuff work
     
  9. Alonso

    Alonso Newbie

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    This is great information! Exactly what I need just for ls1b (blue/red) pcm pin outs. Any help would be muchly appreciated. Thanks in advance.
    The ls1b pcm connectors wouldn't be same as green and blue?
     
  10. Leonardo Zavala

    Leonardo Zavala Newbie

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    Does anyone know what wires are needed to add for the coil packs?
     

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