how do you tell??
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Freshman User
Joined: Dec 2004
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how do you tell??
hi all , on my 84f250, how do i tell if the glow plugs are working?? when i turn it on the light stays on a bit and it starts , but how do i know if the 1 or 2 , glow plugs are not working? i use it for plowing on the farm so it is plugged in when its cold, so that is helping i am sure , i was just wondering. thanks and have a SAFE and happy xmas
Lead Driver
Joined: Dec 2006
Posts: 6,496
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From: So. Jersey
Start with skimming through the 2 posts at the TOP that say READ FIRST: Glow plugs. If your truck is 87-up go here: https://www.ford-trucks.com/forums/9...le-system.html
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
You can test them with a ohmmeter but it has to be capable of reading .5 ohms and a lot of them will not.
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Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Correct and so many make the assumption if the light lights it's gotta be good. That's the difference between static and dynamic testing.
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
The 84 glow plug system don't care if the glow plugs are burnt out or not.
It uses coolant temp and a timer to heat the glow plugs.
So the only test is either the ohm test or the test light test, with the ohm test being the most accurate.
It uses coolant temp and a timer to heat the glow plugs.
So the only test is either the ohm test or the test light test, with the ohm test being the most accurate.
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