glow plug ohm test

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Mar 19, 2007 | 09:39 PM

risky97psd

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glow plug ohm test

hi guys my truck wont start when its cold (40 or less) unless its plugged in. i remember reading about someone ohm testing the glow plugs does anyone know the values and what wires to check. thanks

Mar 19, 2007 | 09:45 PM

444dieselrod

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From: Braham MN

outside pins on each VC connector, Ohm between each pin and a good ground, I use the alternator case.

1.5-3ohm's good, over 3 ohms, or open circuit either a bad wire or bad GP.

Diesel Rod

Mar 20, 2007 | 07:06 AM

tjbeggs

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From: Silver Lake Dunes, MI

yep what he said. ground clamp of ohm meter to battery ground and psoitive lead to glow plug pins on vavle cover connector.

also the outside pins like posted above so it looks like this 1 and 5 are glow plugs

1 2 3 4 5
- - - - -

Mar 20, 2007 | 04:50 PM

believer45

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From: Cincinnati, Ohio

Check THIS ARTICLE on the glow plug system - very complete and detailed. The only change is the part number for the glow plugs from AutoZone is now ZD-11 instead of ZD-10. Ford parts in motorcraft bags for half the cost from the dealership.

Dave / Believer45

Apr 15, 2007 | 04:45 PM

screech.owl

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Help! I have recently installed new glow plugs and glow plug controler. When I tried to start it after the install it started to go through the cycle but stopped as if something blew. Now the glow plug comes on for a real long time and I cannot hear the click of the controler. I have checked and rechecked the electrical connections so does it sound like the barometric or oil temp sensers or what? Any ideas where to go to next?

Apr 15, 2007 | 04:56 PM

believer45

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From: Cincinnati, Ohio

You would do well to start a new thread instead of posting your new question at the end of an old thread. Also, some more information would be helpful.

Year, model and options on your truck.

Any modifications you have done, especially engine related.

Dave / Believer45

Apr 15, 2007 | 05:06 PM

bkcowboss

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From: Herndon KY

Quote:

Originally Posted by risky97psd

hi guys my truck wont start when its cold (40 or less) unless its plugged in. i remember reading about someone ohm testing the glow plugs does anyone know the values and what wires to check. thanks

Check your GP relay, either jump the big posts for 20-30 seconds and then crank the engine or throw a test light on the driverside post when you turn the key on and see if voltage is getting to that post. Usually a no start situation is a GPR and hard start is a GP. Also look at your Valve cover plug pins for burnt/corroded pins