Glow plug relay wires
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Elder User
Joined: Jun 2005
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Glow plug relay wires
Hello all i have a 01 expetition with a 7.3. It is a california model. on the heat plate relay there is a yellow and red wire which goes to the glow plug module, a red hot wire on one side and a brown exciter wire on the other small terminal. The problem is I am not getting the brown exciter wire to ground out and turn on the relay. can't find a good schematic. does anyone know where the brown wire comes from before it gets to the relay? so I can check that item out and see why it is not working. As a result the glow plug relay is not operating and turning on the glow plug moduel and the heat plate glow plug.
Thanks in advance
Thanks in advance
9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
No you dont. You have a 2001 excursion with a 7.3L.
All excursions has CA emissions.
Thats not a glow plug relay, that is the air intake heater relay. Because it is an excursion (not an expedition) and since all excursions had CA emissions packages, it has a GPCM, or Glow Plug Control Module. It is the silver box near the relay you are looking at.
Since you are testing the wrong item, your results are null and void. However, are you for SURE having glow plug problems, and is that why you are testing a relay? If you are, then chances are you need to replace the GPCM, but if that was the case, you would have a check engine light.
Sorry for all of the corrections; just wanted to make sure we are all on the same page here.
All excursions has CA emissions.
Sorry for all of the corrections; just wanted to make sure we are all on the same page here.
Senior User
Joined: May 2011
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From: Portland, OR
For the AIH relay to operate a very strict set of conditions have to be met and interpreted by the PCM, these are:
Ambient temperature must be below 32°F
Engine oil temperature (EOT) must be below 131°F
Vehicle power must remain between 11.5 and 15.0 volts
Parking brake must be applied
The transmission must be in Park or Neutral
Glow plugs must be off
So, if your AIH isn't operating all the time I wouldn't sweat it. A lot of people do an "AIH delete" because it's not all that useful for cold weather starting anyhow, plus the plug site makes a good location for a boost gauge fitting.
Ambient temperature must be below 32°F
Engine oil temperature (EOT) must be below 131°F
Vehicle power must remain between 11.5 and 15.0 volts
Parking brake must be applied
The transmission must be in Park or Neutral
Glow plugs must be off
So, if your AIH isn't operating all the time I wouldn't sweat it. A lot of people do an "AIH delete" because it's not all that useful for cold weather starting anyhow, plus the plug site makes a good location for a boost gauge fitting.
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allright so my fellow mechanic gave me the wrong vehicle, thanks for the correction, my bad. We did replace the GPCM today and we parked the vehicle outside, since it will be around 5 degrees here in colorado springs tonight we will test it in the morning. We did have a glow plug code of 1,3,5,7,and 6 glow plugs, which still came up again after replacing all 8 glow plugs (what a bummer we had to made a special tool to remove the glow plugs),
PaysonPSD, my concern from your Picture is that on the hot that goes from the IAH to thre glow plug also has a yellow and red wire hooked to it which goes to the GPCM ( had full continuity) (both had the same yellow and red wire).
PaysonPSD, my concern from your Picture is that on the hot that goes from the IAH to thre glow plug also has a yellow and red wire hooked to it which goes to the GPCM ( had full continuity) (both had the same yellow and red wire).
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
allright so my fellow mechanic gave me the wrong vehicle, thanks for the correction, my bad. We did replace the GPCM today and we parked the vehicle outside, since it will be around 5 degrees here in colorado springs tonight we will test it in the morning. We did have a glow plug code of 1,3,5,7,and 6 glow plugs, which still came up again after replacing all 8 glow plugs (what a bummer we had to made a special tool to remove the glow plugs),
PaysonPSD, my concern from your Picture is that on the hot that goes from the IAH to thre glow plug also has a yellow and red wire hooked to it which goes to the GPCM ( had full continuity) (both had the same yellow and red wire).
PaysonPSD, my concern from your Picture is that on the hot that goes from the IAH to thre glow plug also has a yellow and red wire hooked to it which goes to the GPCM ( had full continuity) (both had the same yellow and red wire).
The other 0.1% is the connector on the outside or inside of the VC.
Is that yel/red wire 12 ga. If so it is a common 12 volt feed that both the AIH and GPCM need.
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Elder User
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I want to thank everyone for the assisance, the truck started right up the first time. it was the gpcm.
happy holidays
happy holidays
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Post Fiend
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From: Payson, AZ
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