Keyed power source

Discussion in 'GM Electrical Tech' started by Gmman, Jul 24, 2013.

  1. Gmman

    Gmman New Member

    I have a 2007 GMC Sierra Denali 2WD. I am looking for a convenient 12 volt, keyed power source under the bed to mount an Air Lift compressor for the air bags. I have looks at wiring diagrams and they are not much help. Since the main fuse box in the engine compartment appears the same as in the Suburban type vehicles, and has a factory leveling option, I thought that would be a likely source except that it is hot all the time. Needs to be a keyed source in the event of a line, bag failure so the compressor does not run until the battery dies. The compressor system keeps the preset minimum pressure on start up. My thought is that the wiring harness is the same in the trucks and that there might be an unused wire under the bed that I can utilize. I have not looked into tapping into the dash fuse panel yet until I rule out and easier, accessible source. Any suggestions would be appreciated.
  2. GM Customer Service

    GM Customer Service Epic Member 5+ Years 500 Posts


    I understand that you are looking to fix this by yourself. I cannot guarantee that I can find you an answer to your question but I would like to reach out to some of my internal resources. Private message me mentioning this thread including your VIN and I can start looking into this for you.

    Safe travels,

    Jennifer T.
    GM Customer Care
  3. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    [MENTION=62332]Gmman[/MENTION], the problem you are going to have, is that everything is controlled by a computer module. Almost all 12 volt sources are hot at all times. The modules are connected to a data bus. Ignition on and off is now just a "wake up", or a "go to sleep" command.

    There are still a few "key on" points, look in the connector panels under the dash.
  4. Gmman

    Gmman New Member

    I was afraid that there would be some level of computer interface. I will look under the dash as you suggest and see if I can locate a source in that fuse panel. I was hoping that the "leveling circuit" that is labeled, but unused in the main under hood fuse panel would have the companion wiring in the harness going to the rear. I would think that the on board leveling system in the non truck chassis would be ignition keyed. Thanks for the info.

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