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How to test glow plugs

Discussion in 'Other Car/Van Related Technical Information Required / Provided' started by kaliope, Sep 13, 2016.

  1. kaliope

    kaliope Well-Known Member

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    Made a how-to:

     
    PC 1st Aid, Boroboy, M32Guy and 3 others like this.
  2. oberlisc

    oberlisc VxON Club Member VxON Club Member

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    Short and sweet video.
     
  3. andyl

    andyl Well-Known Member

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    One thing i would like to add and it may be a good idea to put into your guide is that some of the newer glow plugs have really low voltage, some as low as 4.4V (Corsa D 1.3 cdti, ngk plug number Y9004AS) so testing them across a battery could in fact destroy them so its always advisable to check the side of the glow plug first to see what voltage they are, its usually printed on the side, if you cant read it then just go online and check your plugs on the NGK specification web site.

    This is only meant to help you so please dont take offence, its better to have this in your guide than for someone to blow there plugs testing them across a battery.(y)
     
  4. M32Guy

    M32Guy M32 Specialist

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    Nice guide. Digging the tune :whistle:
     
  5. kaliope

    kaliope Well-Known Member

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    Made more accurate measurments, with different meter settings

     
    Boroboy likes this.
  6. g4vvq1983

    g4vvq1983 Well-Known Member

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    Yes you could put a voltmeter on the lead from relay to glow plug, if its battery voltage your away.....i think the resistance of each glow plug should be under 1 ohm, and they normally use about 15 amps when cold and taper off......one of the best way to test glow plugs is put an amp meter in line with battery lead and turn ignition on, should read around 60 amps initially, 4 of them.....from Fred in Essex.
     
  7. kaliope

    kaliope Well-Known Member

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    Ive been told on a few forums, brand new glow plug is 1 ohm
     
  8. g4vvq1983

    g4vvq1983 Well-Known Member

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    Yep it about that, use ohms law. I=ExR lol, the more current you want to flow the low the resistance, or the higher the voltage, so if you want 15 amp, well the battery voltage is nearly 15 so that's 1 ohm, if however the voltage is 12 volts the resistance to get 15 amps to flow would be 0.8 ohms, so you see what i mean....anything under 1 is prob ok as long as its not a dead short...Fred.
     

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