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Glow Plug controller issue

Discussion in '1982-Present GM Diesel' started by savagek5diesel, Feb 2, 2004.

  1. savagek5diesel

    savagek5diesel 1/2 ton status

    Nov 20, 2003
    Likes Received:
    Redding California
    /forums/images/graemlins/1zhelp.gifHey guys, just the other day something went wrong with the glow plugs and i'm stumped on fixing it /forums/images/graemlins/thinking.gif. I have the Haynes Diesel repair manual but it's diagrams might as well be in japanese. My truck has a manual glow plug switch thats hooked to a remote selenoid on the fender. Well, when i hit the switch, nothing happens, no click like it usually does, no voltage drop, nothing. I thought it might have been the selenoid so i replaced it. Still no luck. I replaced all the glow plugs last week because they were all really worn. Does anybody have advice on getting this done myself? I figured the next step would be going out and buying a multi meter and checking wire after wire. But one of the things thats keeping me from doing that is that the main power to the GP switch thats in the cab isn't getting any power at all. Any advice would be great. Thanks.
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Jul 23, 2000
    Likes Received:
    E-town baby!
    The blue wire coming into the cab needs to be grounded to activate the GP's. It will not have power ever...

    It sounds like the relay (solenoid) is either bad or not hooked up correctly. Did the replacement look exactly like the old one? I recently did mine and there were a few different versions of the GP solenoid at the parts place.

  3. doctor4x4

    doctor4x4 1/2 ton status

    Jan 22, 2002
    Likes Received:
    Los Angeles
    sounds like time to dig out the test light and make sure ya havnt blown a fuseable link or if a wire got discoed some were
    time to go hunting with your test light
    find were power stop and start and fix
    Good luck
    P.S. oh ya can ya run a little wire between the 2 Large post's r and get power to the plugs with ignition on ?? ??
    you should be able to

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