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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 01-18-2007, 10:01 PM   #1 (permalink)
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glow plugs not working!

ok the glow plugs not kicking on ! it is new controller! engine turns over great! i guess loose wiring! any ideas????
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Old 01-18-2007, 11:47 PM   #2 (permalink)
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Re: glow plugs not working!

Have you done a Test light check on the GPs, what brand were they.
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Old 01-19-2007, 09:13 AM   #3 (permalink)
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Re: glow plugs not working!

What year and what GP system do you have? The 6.9's were available with 2 different systems - where is the controller located?
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Old 01-19-2007, 12:02 PM   #4 (permalink)
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Re: glow plugs not working!

the wait to start light does not come on! the controller is not kicking on, you can tell by the amp gauge! the controller is at the back of the engine! it was working the night before! i check the controller and it is good! the glow are ford glow plugs, i would not
have those junk autolite!







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Old 01-19-2007, 06:55 PM   #5 (permalink)
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Re: glow plugs not working!

i just ran into this the other day and it turned out to be the plug was bad going to the controller

when the engine is cold(when the glowplugs would usually operate the longest) turn the key to on and wiggle the plug on the controller and see if it activates the relay
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Old 01-19-2007, 08:42 PM   #6 (permalink)
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Re: glow plugs not working!

i redid the wiring! and it still won't come on! i tested the glow plugs and they are good!
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Old 01-19-2007, 08:58 PM   #7 (permalink)
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Re: glow plugs not working!

If you want to send me your email via a PM, I will send you a copy of the Ford 87 Solid state glow plug manual. Might help.

One thing I would check is to be sure you have a good ground. The ground wire comes up to a double ended stud, I believe it is an intake stud. Your problem may be in the ground, or it might not. I am not sure how you tested the controller, but the guide I have may help. Does it still have the bullet style glow plugs? If someone converted it to the spade style, it will not work as the controller senses voltage drop accross the bullet type. The spade type do not work in this system. I know these sound like simple questions, but sometimes the solution is simple as well. These trucks have SERIOUS ground issues and I had all kinds of problems, including exactly what you are describing because of these ground issues.
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Old 01-21-2007, 10:10 AM   #8 (permalink)
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Re: glow plugs not working!

Funny you say these trucks have ground issues. I am finding on all diesel forums everyone is having ground issues with the cold weather. Now it takes more to crank and the glow plugs are cycled more too. On my Samurai I added additional grounds for the chassis and ran the main ground directly to the starter bolt. Spun a lot faster and no more issues. Maybe I will do the same on my truck before I start having the same issues.

My truck is 2 weeks old with me and a lot of parked issues are coming up. I am sure there will be a lot of corrrosion from sitting so long. The heater core was rotten thru and only took 4 hours of run time to pop open.
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Old 01-21-2007, 03:43 PM   #9 (permalink)
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Re: glow plugs not working!

When I replaced my cables, I put the grounds to the block as OEM, then ran ground straps from the same stud to the frame and then back to the cab. I also ran straps from the top of the motor back to the cab. I have an electric/hydraulic hoist and ran a ground back to it as well, secured it to a stud on the frame and then continued to the pump. What was funny is I fixed all kinds of problems in the process without even knowing it. The gauges all started to work, fuel was all over before the "paranoid" ground wire attack etc. Everything, even those that seemed to work ok, now work better! I also ran a 10 gauge wire from the engine grounding point up to the GP controller ground, so it should not be a problem again.
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Old 01-21-2007, 06:42 PM   #10 (permalink)
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Re: glow plugs not working!

the only thing i can think of is check the power and the ground at the plug for the controller and test it with a load such as a headlight(something to draw a couple amps)
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Old 01-21-2007, 07:20 PM   #11 (permalink)
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Re: glow plugs not working!

thanks for all the help,I will look at it later this week!
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