Glow Plug Control Module or Glow Plug Relay? - Ford Powerstroke Diesel Forum
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Old 03-18-2010, 03:06 PM
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Glow Plug Control Module or Glow Plug Relay?

So I'm working on this guys 1999 7.3 an the problem is that it won't start below 40 degrees without it being plugged in, I checked the fuel pressure, and filters, I've checked the air filter, and I've check oil level, so next, which I know I should have checked the relay and the module first, but the guy wanted the all the filters changed. So where is the module and relay an how to check
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Old 03-18-2010, 04:58 PM
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the gp soliniod is behind the fule filter and to the left on the top of the motor, looks like the starter solinoid, thats all i could help you with im just learning these powerstrokes myself I think these are supposed to hold 12v for at least 30 sec when key is turned on
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Old 03-18-2010, 05:29 PM
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Any one have a clue where the glow plug control module is
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Old 03-19-2010, 09:33 AM
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So idk if this is right or not but the glow plug control module is only on the 6.0 and 6.4
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Old 03-19-2010, 09:52 AM
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The module would be in the same place - You only have a glow plug control module on Excursions and California emmision trucks. You have a glow plug relay on all other trucks. Its a one or the other, not both kind of thing.

Read here about how to check out your GPR system:

Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
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Old 01-14-2014, 06:59 AM
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I have a 2001 7.3 California truck. It has both the relay and module.
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Old 01-14-2014, 07:22 AM
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Quote:
Originally Posted by dray8165 View Post
The module would be in the same place - You only have a glow plug control module on Excursions and California emmision trucks. You have a glow plug relay on all other trucks. Its a one or the other, not both kind of thing.

Read here about how to check out your GPR system:

Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
yep! this 100% agreed
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Old 01-14-2014, 10:17 AM
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Quote:
Originally Posted by blamo7752 View Post
I have a 2001 7.3 California truck. It has both the relay and module.
The relay you are seeing is the Air Intake Heater relay - it has nothing to do with the glow plugs, but it looks similar and is right next to where the GPR would be.
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Old 02-11-2014, 11:44 AM
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It is old topic but the one search for glow plugs problem put to the top.
I do have 2000 7.3 CA truck with GPCM and am getting intermittent codes for plug #4.
I clean the electric plugs and it seems to help for next start, but it was intermittent before.
I measure plug resistance and when other plugs did show 2.0-2.7 the #4 did show10.2
So it is not dead, but showing higher resistance.
I read about wire harness as well, but looks like I will have to pull the valve cover this way, or the other.
How much work it is?
Do we have any pictorial?

Last edited by Kajtek1; 02-11-2014 at 11:54 AM.
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Old 02-12-2014, 04:42 AM
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Quote:
Originally Posted by Kajtek1 View Post
It is old topic but the one search for glow plugs problem put to the top.
I do have 2000 7.3 CA truck with GPCM and am getting intermittent codes for plug #4.
I clean the electric plugs and it seems to help for next start, but it was intermittent before.
I measure plug resistance and when other plugs did show 2.0-2.7 the #4 did show10.2
So it is not dead, but showing higher resistance.
I read about wire harness as well, but looks like I will have to pull the valve cover this way, or the other.
How much work it is?
Do we have any pictorial?
I just did it in the last week
(1999 Superduty)
It wasn't that bad, just have to not be in a hurry.
A couple of mine had buildup on them and took patience and some "back and forth" to get them out.

If you "google" glow plug replacement, some youtube videos are out there that will give you an idea of all that's involved.
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