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Thread: Wiring Diagram/Fuse box layout-1988 gmc k1500

  1. #1
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    Sep 2011
    East Kootenays/Canada

    Wiring Diagram/Fuse box layout-1988 gmc k1500

    I have a 1988 gmc k1500 extended cab. It was a cold day with lots of snow in the driveway. I put my truck in 4x4 but no light came on, tried it a few times to no avail. I tried looking in the fuse box but could not see a fuse for the 4x4. Does any know where the fuse would go for this particular truck? I wouldn't mind a wiring diagram for this truck so I could trace the wire to the TLA just in case if it is not the fuse. The Haynes manual is pretty vague on this problem. I hear there is a cable posi-Lok to replace the TLA,is this the way to go,or what are the negatives if I installed this cable posi-lok? Any help on this would be much apprieciated. Thanks for any help.

  2. #2
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    Check for power at the actuator..can you hear it engage? click on the red links.Pay no attention to the arrows

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