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Glow Plug Test

Discussion in '1982-Present GM Diesel' started by Dirty Dave, Jan 29, 2002.

  1. Dirty Dave

    Dirty Dave 1/2 ton status

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    Can someone explain to me in the simplest of terms how to test a glow plug to see if it is working. I thought I knew how but since I can't get any of mine to work I think/hope I was wrong.

    Thanks,
    Dave

    They call me Dirty Dave because thats the way I fight. At my age I cant afford to fight fair

    It's just mud how deep can it be?
     
  2. DieselDan

    DieselDan 1/2 ton status

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    Simplest: resistance. Use an Ohmeter to measure resistance from the connector on the end to the threaded portion on the plug. 'Can't remember what the actual value is, but is may vary depending on your plugs (9G, 11G, 13G, 60G?). Infinit resistance means they're bad, zero resistance would be suspect. You can do this on the vehicle but it's a PITA. Usually if I suspect bad plugs I'll check 'til I find a bad one, then replace them ALL. Theory being that they're all similar age so the others (good still) aren't that far behind.

    PS. I always check NEW glow plugs before installing, but then I deal with the DOD's "lowest bidder" philosophy.

    Real trucks don't have spark plugs!
     
  3. surg82k5

    surg82k5 1/2 ton status

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    I would have to say the easiest way to test a glow plug is to get a test light... first get a good ground then unplug a glowplug wire, touch the pointed end with the light on the end of the glowplug if the light goes on the glow plug is good.. if you need farther explanation feel free to ask.
    Sergio

    Check out my new website. <a target="_blank" href=http://www.surg82k5.rockcrawler.com>http://www.surg82k5.rockcrawler.com</a>
     
  4. JORGE

    JORGE 1/2 ton status

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    If you haven,t a test light, you also can to test it with a wire.
    Connect the wire to the positive battery harness.Then remove the harnnes attached to the plug.Now,with the other extremeof the wire , took a few times the phaston conection on the plug body. If it makes sparks, the plug is good. If not ,is broken.
     
  5. JORGE

    JORGE 1/2 ton status

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    Touch the phastom ,no "took".Sorry.
     
  6. Parf

    Parf Registered Member

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    I like to short them between the top positive post on my battery, and the radiator support. If it glows, it's good. [​IMG]

    <font color=blue>Parf</font color=blue>
    1984 K5 Jimmy 4x4 Sierra Classic
    6.2L diesel, 700R4
     
  7. calcide

    calcide 1/2 ton status

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    A resistance check would be a very easy way, each glow plug should have about .8 ohms (I read that 60G plugs draw 15 amps each, making their resistance about .8 ohms) of resistance from the spade connector to ground. To be able to accurately measure this though, you will need a pretty decent multimeter and you should remove the wire going to the plug. I recommend Fluke products.

    The easiest way would be to use a clamp-on ammeter. Just clamp it on and measure the current going through each glow plug. I recommend Fluke and Amprobe products for this, just make sure they can measure DC amps and have a low enough range.

    BTW, that battery/radiator support test is pure genius.[​IMG]

    <font color=red>When in doubt, empty the magazine. </font color=red>
    <a target="_blank" href=http://www.geocities.com/calcide>http://www.geocities.com/calcide</a>
    1983 K5 Blazer Silverado, 6.2L Diesel
     
  8. Dirty Dave

    Dirty Dave 1/2 ton status

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    Parf thats the way I did it...and trying the resistance method I got the same results..all the plugs where toast. Thanks to everyone the search for the cause begins tommorow. First thing is to interrogate my girlfriend since she drove it last time it ran.

    Thanks to all.

    Dave

    They call me Dirty Dave because thats the way I fight. At my age I cant afford to fight fair

    It's just mud how deep can it be?
     
  9. Dirty Dave

    Dirty Dave 1/2 ton status

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    Interrogation has reveiled that she forgot and left the manual switch on for "a little while"

    hmmm, guess now is a good time to work the bugs out of my glowplug system.

    Thanks again everybody.

    They call me Dirty Dave because thats the way I fight. At my age I cant afford to fight fair

    It's just mud how deep can it be?
     
  10. Terry

    Terry Registered Member

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  11. 4x4_76

    4x4_76 1/2 ton status

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    <a target="_blank" href=http://freeautoadvice.com/diesel/glow.html>Clicky</a>



    '80 K5,355/350/205,soon 6.2 diesel swapped in and 33" tires[​IMG]
     

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