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  1. #1

    Default What the heck did I blow?

    I have a 1997 GNC Suburban with the 5.7l.
    THe power window lock was not working, so I did a dumb thing and jumped the hot lead to one of the other three leads and PRESTO, the other three windows would operate on their own once again. I didn't start the truck then, but everything worked normally with the key in the accessory position.


    THe wife tried starting the truck and got nothing. By nothing I mean no dash lights, no cranking, absolutely nothing. As if the battery was removed. I checked the battery and it still has proper voltage.
    So I inspected all of the fuses in the underhood box on the driver's side, as well as the fuses in the panel on the driver's end of the dash. All look good.
    Wondering if I had blown the starter relay, I swapped in the identical relay from the A/C. Still nothing.

    What else can I check?
    Could I have fried the ECM somehow?

    If someone has the wiring schematics, I jumped the yellow wire (terminal 1 of 4) to the dark blue wire (3 of 4).
    And remember, the damage was done not when I jumped the terminals, but when I tried to start it with those terminals connected.

    Please help!

  2. #2


    did you run the battery down while you were testing the windows? Here is a screen shot of the schematic
    Attached Thumbnails Attached Thumbnails Capture.jpg  

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. #3


    Thanks for the reply Pikey.
    The battery still has a full charge.
    Looking at the schematic, I only see two wires for the lockout switch, yellow (hot) and dk blue, which are the two I connected. I may not make any difference to the solution, but in reality there is also a black (I assume ground) wire and a dk brown wire that go to that switch.

    I strongly suspect I blew, or short circuited something, even though your schematic makes it look as though my solution should have worked.

    Other than the two fuse areas I checked, do you know what else might have tripped that would make the vehicle act as if there is no battery at all?

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