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1992 Ford F350 7.3 Diesel, put in new glow plug controller, controller clicks off and on, but no power to glow plugs. What could cause this?

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Hi Margaret , Does the glow plug wait to start indicator light on the dash come on ? And then go off after a couple of min. ? Check fuse K 20 amp in the under hood fuse box .This is one of three B+ power supplies to the glow plug control module > Two fusible link's are also B+ power supplies to the module . There is a 10 amp fuse located in the inside fuse box , fuse # 17 , this is power for the indicator light !

Posted on Dec 30, 2016

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1992 Ford F350 7.3 Diesel, put in glow plug controller, controller clicks off and on but no power to glow plugs.


Maybe you got a bad glow plug controller ! Did you use a aftermarket part or OEM replacement ?

Dec 31, 2016 | 1992 Ford F350

1 Answer

89 Ford E350 Diesel - two problems 1) no power to instrument cluster, 2) diesel will not fire off without starter fluid...but the glow plug solenoid does click and wait light goes off


You should never use starter fluid when the glow plugs are hooked up. It can cause severe engine damage. You probably need to replace all the glow plugs and the glow plug controller.

Jul 06, 2014 | 1989 Ford F 350

2 Answers

My 1992 diesel pajero which is import from japen, has problem with glow control unit, it not working, every morning it hard to start. i had replaced the control unit, it wan't help, does some one


You need to check that you are getting power to the glow plugs, when the light shows on the dash you should have 12V to the glow plugs, if you do have 12V at the glow plugs and it still is having issues starting then your glow plugs may need to be replaced. You can buy them off ebay at reasonable prices.

Mar 07, 2012 | Cars & Trucks

1 Answer

1992 F250 7.3 idi diesel glow plug relay has power to two large posts and one small post and the second small post pulses when activated. I checked ground to engine and seems to be gounded fine. Any ideas...


Have you checked the glow-plugs? On that system if one glow-plug is burnt up than it will not let the main relay in the controller to kick in.
Check all the glow-plugs make sure they are working.
The easiest way to check them is with a regular 12v test light.
Hook up the negitive end (aligator clip end ) to the battery + terminal and than with the other end of the test light ( pointed end ) touch each glow- plug connector tip ( with the glow-plugs harness connector removed ) and see if the test light lights up.
If the test light up--- glow-plug is good. If not than the glow-plug is bad--burnt out .

Feb 13, 2010 | 1992 Ford F250

1 Answer

Glow plugs want work


Have you checked out the glow plugs to see if they are still good? Also pick up a copy of Haynes Diesel Engine Repair Manual, part#10330. Starting on page3-36 they have an excellent diagnosis section for your glow plug system. Hope this helps.

Oct 22, 2009 | 1992 Ford F350

1 Answer

I have change the glow plug relay its brand new bt i didnt change the glow plug will that cause it not to start


The operatoin of the glow plugs heat up the combuston chamber before turning over the engine. ONce the fuel hits the combustoin chamber , The fuel will ignite.

The diesel engine only runs on air and fuel .

The glow plugs are basically a resistor that heats up the combustion chamber or pre combustion chamber.

So if the glow plugs are getting power now that the relay is change out , Yes the glow plugs have a major roll in starting the engne.

I hope this was helpful

Mar 26, 2009 | 1992 Ford F250

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