Need wiring diagrams for 1990 GMC Suburban

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  • hotsauce19
    Junior Member
    • Mar 2013
    • 6

    Need wiring diagrams for 1990 GMC Suburban

    Looking for wiring diagrams for 1990 GMC Suburban 350cu inch carburated. This particular model was manufactured in Mexico. Mitchell OnDemand does not have the diagrams in their database. Appreciate any help on this.
  • Crusty
    Senior Member
    • Dec 2007
    • 2450

    #2
    I suspect the vehicle is a carry-over from circa 1986 or possibly 1987. You may find something very close to, if not exactly, what you have in front of you.
    Things such as C or K for the fith digit, or possibly R or V as those were the designations for the old body style and the new body style in those years.
    Also of importance is the weight design of the vehicle, Is it a 1500, 2500 or 3500 series??
    A full VIN might shine some light on things for us to make an attempt to steer you in a direction that may help.
    C & R were 2-wheel drive and the K & V were the 4x4's.

    Comment

    • hotsauce19
      Junior Member
      • Mar 2013
      • 6

      #3
      VIN for GMC...

      The particulars for the Suburban:
      VIN- 3GCEC26L6LM134488
      2WD
      Weight 2500

      Hey brother thanks a million for the quick response.

      Hotsauce19
      SA, TX

      Comment

      • hefaus
        Senior Member
        • Dec 2007
        • 435

        #4
        Wiring Diagrams

        Originally posted by hotsauce19
        The particulars for the Suburban:
        VIN- 3GCEC26L6LM134488
        2WD
        Weight 2500

        Hey brother thanks a million for the quick response.

        Hotsauce19
        SA, TX
        Hi What wiring diagrams do You need?

        Comment

        • hotsauce19
          Junior Member
          • Mar 2013
          • 6

          #5
          wiring diagrams...

          Hello back! Going to need everything i.e. component location, electrical and performance schematics.

          Comment

          • Crusty
            Senior Member
            • Dec 2007
            • 2450

            #6
            According to the VIN, it was produced in Mexico, is a 2-wheel drive with an "L" engine.
            From what I can remember they stopped producing carbureted vehicles in 1986 or 1987.
            Take a look in Mitchell and see what they do show for an earlier build.

            Take note as well, is the carburetor a CCC system-?? If it has a TPS and an Oxygen sensor it is a Computer-Controlled-Carb.

            Trying to gather ALL the information would be a daunting task for us but if anyone can Hefaus is the man-!!

            Comment

            • hotsauce19
              Junior Member
              • Mar 2013
              • 6

              #7
              1990 GMC

              Crusty,

              NOT CCC.

              Comment

              • disonesto
                Junior Member
                • Dec 2012
                • 14

                #8
                this is all my OnDemand5 shows R2500 and V2500 showing same
                Attached Files

                Comment

                • hefaus
                  Senior Member
                  • Dec 2007
                  • 435

                  #9
                  Wiring Harness

                  Hi. I have looked high and low for this information in my collection of repair manuals. I just cant seem to find it. I am sure it's packed away somewhere. Keep Smiling. I will try to find it.

                  Comment

                  • hotsauce19
                    Junior Member
                    • Mar 2013
                    • 6

                    #10
                    wiring diagram...

                    hefaus,

                    Apologies for the delay as we are shifting in and out other repair jobs. As it seems we desperately need diagram for fuel system including and up to the instrumentation cluster. Thanks again for your attention.

                    I have been instructed to include my phone number for any replies.

                    Regards,
                    Frank
                    210-355-3942

                    Comment

                    • hotsauce19
                      Junior Member
                      • Mar 2013
                      • 6

                      #11
                      Fuel Quantity Sending Wiring Diagram For 1990 Gmc Suburban Manuf In Mexico

                      This A Vin L Vehicle 2500 Series With A Quadro Jet Carburated (no Tps). It Has A Mechanical Fuel Pump-only Component In Fuel Tank Is Fuel Qty Sender. We've Replaced Fuel Sender (in Tank) And Fuel Guage And Indicator Still Indicates "empty". We Need Wiring Diagram. Vin #3gcec26l6lm134488

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