spiffy
Member Since: 19 Sep 2017
Location: Norway
Posts: 8
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| Does the glow plug resistance change with temperature? |
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From the webasto manual it says 0.3-0.4 ohm @ 24C.
I measured mine outside at about 0C and it was about 1ohm. So I wonder if the resistance change with temperature or if mine is  . Because my heater won't fire up. I've cleaned everything out and it worked for a while then seemed to shut off too soon and now it no longer turns on again.
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 14th Feb 2019 12:42 pm |
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ronald.soak
Member Since: 29 Apr 2008
Location: London
Posts: 515
  
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I would have expected the resistance to increase with temperature. Can you switch it on then off and measure before it cools?.
Not easy to understand what might be happening. A partial internal short would reduce the resistance. Possible corrosion problem?.
Good luck
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| 14th Feb 2019 2:02 pm |
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Net_fisher2
Member Since: 23 May 2017
Location: Isle of Wight
Posts: 99
 
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Yes, Resistance does change with temperature.
Not certain of the wire used in the FBH,
But if you Google "Temperature Coefficient of Copper" should answer...
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| 14th Feb 2019 3:02 pm |
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spiffy
Member Since: 19 Sep 2017
Location: Norway
Posts: 8
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I thought so based on my experience with water and air temp sensors but they often have a diagram to reference the resistance to the temperature so you could check resistance at various temps but I can't find that for this part, only the resistance at 24C.
Also read that you can't use a two conductor measuring method so that means my measurements might not be accurate actually.
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| 14th Feb 2019 4:25 pm |
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