Working on my sons 2004 f350. Based on the vin, told it is a late build. Have three codes for glow plugs 3,5,7. 3,5 ohmed outside of specs, but 5 was ok. Got a used glow plug module installed and the code for 5 went away.
Today picked up two glow plugs and wire harness from Ford.
Wasn't easy, but removed the harness and plugs but wrecked one plug in the harness.
Now the strange part, took the new harness 4c3z12a690aa out of the box and it was too short? Ford is now closed. Called around to auto part stores, oreilly had the same short harness. But also had a longer one, the plug spacing didn't match so I skipped over it. And it is a dorman product too.
Went home and typed the number on the broken harness and found it was a navistar # for 2005 and up production.
Checked oreilly again and they had a harness for 2005 so off I went to get it. Got home and the plug in won't mate up to the factory harness.

Well won't get it fixed this weekend.
Went to an invoice we got when we got the truck showing work done a couple years ago. Glow plug harness 4c2z12a690ab was installed back then.
That also shows for 2004-2010 Ford diesels

What the heck? Why so many variations. Very confusing trying to track down what I need.
Just venting.

 

The glowplug harness is different from left and right. You need the right side harness (passenger-side bank 1,3,5,&7)
part # 4C2Z-12A690-AB
The drivers side (even bank 2,4,6,&8) is
part # 5C3Z-12A690-A

That's the only variations for the newer style that I'm aware of.

 

Pete - maybe you could help clear up a question I have had for awhile on these harnesses (I understand the OP's frustration on these harnesses!)-

My information shows 4C3Z-12A690-AA (left) and 4C3Z-12A690-BA (right) for the short period of 8/17/03 to 1/15/04.

After that, 1/15/04 and later, it is 4C2Z-12A690-AB (left) and 5C3Z-12A690-A (right) - just as you posted!

I also show that 4C2Z-12A690-BA (again, for the right) was superceded to the number above (5C3Z-12A690-A).

I have not ever been able to validate the different part numbers for the 8/17/03 to 1/16/04 time period), but it seems that the OP got bit by this "anomaly"

 

What about earlier production date numbers?

 

GLOW PLUG BUSS BAR(S) - 2003 MY:
Right (pass) Side 3C3Z-12A690-BA
Left (drivers) Side 3C3Z-12A690-AA

 

Thanks Mark. Just wanted to make sure everyone was covered if they are researching.

 

Just to be clear though - I am still a little confused about the early 04 part numbers, and what I posted isn't "confirmed" ..... in my mind anyway.

 

I know the glow plugs changed as well, some being shorter, so when I went to the dealer I used the vin to get the parts.
When I noticed the harness confusion I removed one of my new gps to compare the length to the old one. Didn't want to risk engine damage because of a keystroke error.
Seems I did get the correct gps.
That number 7 gp is not easy to access.

 

Interesting, The Autonation WBL parts system show 4C2Z-12A690-BA and 5C3Z-12A690-A to both be valid, but different parts (with different prices). Everything I find says they are BOTH for the driver's side 05 and up (possibly for everything after 1/15/04).

 

What is the engine build date on your truck?

 

The link below shows 5C3Z-12A690-A to be correct for the drivers side and 4C2Z-12A690-AB to be correct for the passenger side, Years 04-07, but after 1/15/04:
https://puredieselpower.com/ford/04-...g-harness.html
https://puredieselpower.com/ford/04-...g-harness.html

TASCA parts shows 4C3Z-12A690-AA (passenger) and 4C3Z-12A690-BA (driver) to be for 05 and up:
http://www.tascaparts.com/oe-ford/4c3z12a690aa
http://www.tascaparts.com/oe-ford/4c3z12a690ba

BUT, PureDieselPower states the 4C3Z-12A690-AA (passenger) and 4C3Z-12A690-BA (driver) are for 8/17/03 to 1/15/04:
https://puredieselpower.com/ford/03-...g-harness.html
https://puredieselpower.com/ford/03-...g-harness.html


confusing .......... but I tend to believe PureDieselPower (their information and "note of caution" is more specific). Especially hard to believe the Ford parts system after giving the OP the wrong part!

 

I don't know the engine build date, how is that determined? Last fall we put in a couple injectors and then we were told it was a late build 04 based on the vin.
I am lucky enough to live near the WBL autonation so we get parts from them. Great prices.
This part was just the final straw in a string of errors this week.

The son is graduating so we ordered invitations early. They show up and have date misspelled. How do you misspell a date?
Went to NAPA for an oil filter for my boat. Got home, wrong filter.
Exchanging oil filter, stopped at John Deere for an air filter. Get home, wrong air filter.
That is still sitting on the workbench.
Then this harness issue happens.
Oh yeah, my 1/4 craftsman ratchet stopped working while removing the GPs too.
Small problems but they just add up.

 

Wow - not a good run, but I suspect we all go through similar "streaks"!

I had the same type of issues on my 97 7.3L. Multiple wrong parts, multiple times. One of the issues involved getting the right part bag (correct number on it), but all the parts in it were wrong. It was a spring kit. It had been opened and someone at AN WBL (apparently) had swapped parts out of it.

As an FYI - the designation of a late build 04 is typically after 9/29/03 and it relates largely to the high pressure oil system (also to the EBP software update). However, in glow plugs, it appears that there is that intermediate range of 8/17/03 to 1/15/04.

After doing quite a bit more digging this morning, I believe that 04's AFTER 1/15/04 need the harnesses:

4C2Z-12A690-AB (passenger)
4C2Z-12A690-BA (driver)

... and I believe that the 4C2Z version of the drivers side was updated to 5C3Z-12A690-A for 05 and up.

 

I appreciate all the input. Confirms my confusion.
Worst part is the timing. Yesterday was the only nice weather we had. Rain/snow cold for the next several days, and the truck is too tall to fit in our garage. Oh well, worked in bad conditions before, at least the bugs won't bother us.

 

I don't have anything confirmed to help with the confusion but only speculation. I don't know but maybe the later ones have longer leads for better routing?
Maybe Anthony Run6.0run or M-chan knows. They are pretty savy with the part numbers.