Late build 04 vs 05-10 glow plug harness question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 04-26-2019, 07:32 AM Thread Starter
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Late build 04 vs 05-10 glow plug harness question

I am getting ready to replace my glow plugs. I’m pretty sure I have a late 04 built motor. Sticker is gone on valve cover but I do have the ICP sensor in the cover near the alternator.

First question, do people usually replace the harness every time they put in new glow plugs.

Second? Will a harness for a 05 work on my truck? Amazon has a set of Motorcraft OEM harnesses but the description says 2005-2010. Will these work?
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post #2 of 13 Old 04-28-2019, 06:43 PM
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I'm pretty sure your ok with the later harnesses . I own a late build 04' ( march 04 ' ) and I used the 05-07 part # . Like you
mentioned , the icp at the front of the passenger side valve cover is the tell all between early and late .
You're probably going to wreck the old harness getting them off to change the plugs , so it's not a bad idea to have new ones on hand .
@djmaguire knows this stuff like the back of his hand , maybe He can confirm .
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post #3 of 13 Old 04-28-2019, 06:47 PM Thread Starter
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Good to know. I will order the harness along with the glow plugs. Had no idea it would wreck the harness.
Thank you so much for your help.


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post #4 of 13 Old 04-28-2019, 06:51 PM
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There is a glow plug harness remover special tool, or you can fab one. That is more if the one you put on needs to come off later. The 14 year old harness probably won't stand being removed.
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post #5 of 13 Old 04-28-2019, 06:56 PM
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Quote:
Originally Posted by SkullsMN View Post
First question, do people usually replace the harness every time they put in new glow plugs. ...
I would. They aren't that expensive and they are riding in nasty heat. That's in addition to what @HP MACHINE said.

Quote:
Originally Posted by SkullsMN View Post
... Second? Will a harness for a 05 work on my truck? Amazon has a set of Motorcraft OEM harnesses but the description says 2005-2010. Will these work?
[Incorrect statement removed]

PLEASE JUMP DOWN A FEW POSTS TO @bismic 's POST BELOW.

It's here (for the really lazy!):

https://www.powerstroke.org/forum/ge...l#post16277353

He knows everything there is to know about GP harnesses.

I'm guessing that the 200X-2010 range is because the 6.0 was used in vans through 2010.

The only big big deal with glowplugs is not sticking early model glowplugs in a late model engine. They are longer and one revolution is all it takes.

Quote:
Originally Posted by HP MACHINE View Post
@djmaguire knows this stuff like the back of his hand , maybe He can confirm .
You are too kind.

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Last edited by djmaguire; 04-29-2019 at 07:50 AM.
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post #6 of 13 Old 04-28-2019, 07:20 PM
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Quote:
Originally Posted by djmaguire View Post
I would. They aren't that expensive and they are riding in nasty heat. That's in addition to what @HP MACHINE said.



Yes. There is only early and late. 2005+ means 2004.5+. I'm guessing that the 200X-2010 range is because the 6.0 was used in vans through 2010.

The only big big deal with glowplugs is not sticking early model glowplugs in a late model engine. They are longer and one revolution is all it takes.



You are too kind.
More like Grateful . You've helped many of us . Thank you .
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post #7 of 13 Old 04-28-2019, 08:21 PM
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Quote:
Originally Posted by djmaguire View Post
I would. They aren't that expensive and they are riding in nasty heat. That's in addition to what @HP MACHINE said.



Yes. There is only early and late. 2005+ means 2004.5+. I'm guessing that the 200X-2010 range is because the 6.0 was used in vans through 2010.

The only big big deal with glowplugs is not sticking early model glowplugs in a late model engine. They are longer and one revolution is all it takes.



You are too kind.

i wondered about that i was thinking the 6.4 08-10 ight use the same glow plug harness? seems like i read that someplace but
seems more certain that the 6.0 was used in vans up to 2010 i had forgotten that

and DJ there are good reasons why you are the librarian or "orgcyclopedia" but you got the links to every needed bit of info on these trucks man i dont know if you realize how truly impressive and useful that vast wealth of knowledge is
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post #8 of 13 Old 04-29-2019, 02:57 AM
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Just a little detail on the harness mess when it comes to part numbers (there actually are early, mid, and late part numbers when it comes to glow plug harnesses)-

The EARLY 2004 build date is earlier than September 29th, 2003, you should consider yourself the owner of a 2003 truck, when it comes to ordering any and all engine parts:
Passengers (right) side GLOW PLUG BUSS BAR - 3C3Z-12A690-BA
Drivers (left) side GLOW PLUG BUSS BAR - 3C3Z-12A690-AA
Engine Harness # 3C3Z-12B637-BA (Navistar ID# 1843797C93)

For 2004:
Look at your ICP sensor on the passenger side valve cover. Pay attention to how the GPCM is bolted up to the bracket that secures to the valve cover. If you happen to have it secured in a manner similar to a 2003 engine (HORIZONTAL ORIENTATION), you have a mid/late build 2004 engine (FROM 08/17/03 to 01/15/0). As such, your engine uses glow plug harnesses part numbers 4C3Z-12A690-AA (Navistar ID# 1845915C9) right side, and 4C3Z-12A690-BA (Navistar ID# 1845793C9) left side (engine harness Ford part number 4C3Z-12B637-AA (Navistar ID# 1844262C93))

If you have your GPCM mounted on the bracket, identically to the way it is on 2005 and later engines (VERITCAL ORIENTATION), you have a late/late build 2004 engine (04 AFTER 1/15/04). As such, your engine use glow plug harness Ford part numbers 4C2Z-12A690-AB (Navistar ID# 1845794 C9) right side, and 4C2Z-12A690-BA (Navistar ID# 1845695 C9). Notice, the right side glow plug harness part number is also identical to that, that is used on '05 and later engines (engine harness Ford part number 4C3Z-12B637-CA (Navistar ID# 1846377C92))

For 2005 and up the drivers side is a different part number:
Drivers (left) side 5C3Z-12A690-A
Passenger (right) side 4C2Z-12A690-AB - note it is the same as the late 04

Early build 2005 Engine Harness F-Series (EBP mounted to T-Stat housing) - 5C3Z-12B637-AA
Another Engine Harness: '05 to '07 F series
This harness will fit 03 and 04 engines also. It comes with routing instructions - 5C3Z-9D930-A

Engine Harness: 2010 E series - 6C2Z-12B637-U

Last edited by bismic; 04-29-2019 at 03:22 AM.
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post #9 of 13 Old 04-29-2019, 07:43 AM
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Quote:
Originally Posted by bismic View Post
Just a little detail on the harness mess when it comes to part numbers ...
Sorry guys. I didn't know about the one in the middle. I'm going to edit my post above to refer everyone down here so that someone doesn't stop at my post and end up not knowing the scoop. Thanks Mark!
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post #10 of 13 Old 04-29-2019, 11:26 AM
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i LOVE this place
i can think of no better location to track down info like that
thanks you guys
and just a reminder

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Last edited by john galt; 04-29-2019 at 11:32 AM.
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