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Thread: No glow plug light

  1. #1
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default No glow plug light

    I have no glow plug light, code #29 (glow plug relay fault). The relay is functioning, also the glow plugs. Fuses in the cab are OK. I found a circiut diagram from this site for a 96, that shows a fuse in the engine compartment, between the left side glow plugs and the connection to the light and ECM. Anyone know where the fuse is for a 1994?
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  2. #2
    Join Date
    Oct 2012
    Location
    Wooster, Ohio
    Posts
    9

    Default

    could the bulb just be blown out? if it is i just got a whole bunch of twist base bulbs way too many for what i need so let me know.

  3. #3
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    Thanks for the offer, I forgot to say that the bulb is OK and I've cleaned and retensioned the contacts at the back of the instrument panel. I'm sure that the problem is in the engine compartment, but don't want to pull the wiring loom apart.
    Last edited by grancito; 11-22-2012 at 09:18 PM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  4. #4
    Join Date
    Jul 2007
    Location
    Attica, OH
    Posts
    1,061

    Default

    Not sure if this will help you, or if your fixed already. I do know on my 93 that the dash light is powered from the wire harness going to the glow plugs from the power out post of glow plug relay. if and where a fuse would be i don't know. My glow plugs are hooked up manualy thru a simple solenoid, not the factory relay anymore, and the dash light works as it should.
    93 chevy K2500 6.5TD 4x4 4l80e auto
    Custom flatbed with foldaway gooseneck ball
    SSDiesel DB2 injector pump marine injectors
    Upgraded turbo ( no id tag but lots of boost)
    SSDiesel 4" exhaust, no muffler, SS crossover
    Rebuilt 4l80e tranny Transgo stage 2 shift kit
    rebuilt HD torque converter
    4x4 Posi Lock
    Opened up air box, stock filter
    Boost, Pyro, Tranny gauges in A-pillar
    Cowl hood, all new paint.
    SS Diesel Cooling upgrade, single tstat Dmax fan,
    '98 HO waterpump.

  5. #5
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    After a lot of searching on google, I found that there is a fuse bottom right, 5 amp on the fuse block inside the cab. Mine has no power when the glow plugs are on. Then next time I went to start it the light came on, since then no. So the connection through the plug in the fire wall is bad, and there is one each side of the engine compartment, with about 50 wires in each, perhaps the connection in the loom where that wire connects to where the left side glow plug wires divide from 1 to 4 is bad. I am not going to pull the loom apart. Will eventually run a new wire from the relay to the fuse box.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

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