Recurring glow plug light - 1984 - F-250 - 6.9L - Diesel Forum - TheDieselStop.com
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Old 01-29-2007, 11:58 AM   #1 (permalink)
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Recurring glow plug light - 1984 - F-250 - 6.9L

OH Great Gods of Glow Plug System knowledge...
My glow plug system works OK right now, last week the glow-plug light started cycling on and off every 10-12 seconds and stays lit for a second or two max. This is happening even after the engine is at temp. It is cold outside (15F) but this did not happen in the past.
What is broke and how do I fix it??? Your help is greatly appreciated.
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Old 01-29-2007, 01:22 PM   #2 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

It sounds like an issue with the GP controller, which screws into the back of the drivers' side cylinder head.

I'm wondering with the cool weather, if the motor is just not getting hot enough to turn the controller all the way off.

The controller threads into a coolant passage, and the hot coolant turns the controller off. It's entirely mechanical in design, no sensors etc.
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Old 01-29-2007, 03:48 PM   #3 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

Roboto - Thanks for the heads up will take a look at this tonight, maybe I can determine something.
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Old 01-29-2007, 07:00 PM   #4 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

Maybe use one of those infrared temperature guns to see how hot the block is near the GP controller? It activates the glowplugs anything below 165 degrees F, so if the block in that area isn't at that temp, it could very well be doing exactly as it's designed like Roboto said.
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Old 01-29-2007, 07:02 PM   #5 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

Do what I do, put a pizza box in front of the radiator. It really helps heater output. I haven't even had a fan on it in 2 months. No need in the winter unless you idle extensively (more than 10 minutes at a time).
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Old 01-29-2007, 07:29 PM   #6 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

[ QUOTE ]
OH Great Gods of Glow Plug System knowledge...
My glow plug system works OK right now, last week the glow-plug light started cycling on and off every 10-12 seconds and stays lit for a second or two max. This is happening even after the engine is at temp. It is cold outside (15F) but this did not happen in the past.
What is broke and how do I fix it??? Your help is greatly appreciated.

[/ QUOTE ]
Your controler is begining to fail!
I put a push button between the controler and the relay to stop the relay from seeing the signal from the controler!My truck is still set up this way and still going strong!This happened to me 5 or six years ago and that is what inspired me to put in the button!This way you still have the timed start just not the after glow!Which is what is happening to yours the contolers after glo is what is failing!
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Old 01-30-2007, 07:54 AM   #7 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

Dear Fred: Thank you for the idea, I have no clue how to do this but i will look at it tonight and see what you are talking about. If I can get a new controller, I will put it in...but if not I will strongly consider your thought. If you would be so kind, tell me how you do this job,...where to tie in the button and if it sees high current, etc. That way I can put a diagram together in my head.
Appreciate your time and knowledge, bye the way my '84 has 310K and going strong, just keep fixing stuff...
Best Regards,
Pete McGuinness
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Old 02-02-2007, 08:18 AM   #8 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

remove the wire from control unit at the relay (Small wire) -------------------------------- Attach that wire to a momentary switch or button on the dash.Run another peice of wire from other side of that switch on the dash directly to where the wire was on the relay!I recomend getting some 16 or 14 /2 wire that is 2 wires in one condutit to do the job to make it neat!

will look like this


controler wire-----------------------------
.................................................. .......>dash switch
relay small pole --------------------------

its a simple fix

Good luck

if you have problems just pm me!I come her almost every day!
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Old 02-03-2007, 07:57 AM   #9 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

It agree, the controller is starting to take a dump. I don't know why, but I've never had a problem with the stock controller.(me knocks on wood) So I can't see why peeps are so afraid of them. Also, my 85 has employees driving it, so I can't trust them with a push button.

One thing that I allways do is, whenever I do anything that involves draining the coolant. I allways turn the controller out untill there is coolant seeping around the threads. That way it bleeds any air that could accumulate around the bottom of the controller. You might try it, if you've done anything with he coolant lately, or if you have a persitant low coolant problem.

I have a brand new spare that I got off ebay for $10.00 It's glow plug season, so the price might go higher than summer. But the guy still offers them at a $10.00 starting bid.

http://cgi.ebay.com/ebaymotors/Glow-Plug...1QQcmdZViewItem
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Old 02-18-2007, 07:42 AM   #10 (permalink)
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Re: Recurring glow plug light - 1984 - F-250 - 6.9L

Gods of Dieselstop:
Yes it was the controller, I broke down and bought a new one from NAPA ($100) and put it in, problem solved. I went this route as I am a stock system guy, but appreciate all the help with wiring out the controller, just am not that talented. Thanks for all the help and advise. One note, it sure was a bugger to get out, I think the factory guy had big arms!!!
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