Hey folks, I’m looking for recommendations on a FICM wiring harness. I put in a new FICM, but the clips on the harness are broken, so it keeps wiggling loose and making the truck run poorly. I think I might need new injectors too, but I want to replace the harness first and see if that solves the problem.
I’d prefer to buy from a Canadian company, but I’m open to other options. Thanks for the help!
I’ve replaced both full harnesses and just the pigtails on a bunch of trucks. On my personal 6.0 beater, I’ve got the FICM connectors zip-tied in place.
Ansel said:
I’ve replaced both full harnesses and just the pigtails on a bunch of trucks. On my personal 6.0 beater, I’ve got the FICM connectors zip-tied in place.
I tried zip ties, but it’s still rattling loose. Figured it’s time to just replace the harness and fix it for good.
@Wynn
Good call. I zip-tied the ECM on my semi, and it’s held up for years—still there, actually. If you were in California, I could send you one. I know tons of people with parked 6.0s they use for parts, so I usually get stuff free or really cheap.
You can just replace the connectors instead of the whole harness.
Bali said:
You can just replace the connectors instead of the whole harness.
The truck has 340,000 km on it, so I’d rather replace the whole harness and be sure all the wiring is in good shape.
Forgot to mention—it’s an 06 F-350 6.0.
The three FICM connectors are split between the Injector Harness (2 connectors) and the Main Engine Harness (1 connector). If you go with Motorcraft, it’s going to cost at least $1,000. For a budget option, check out Prosource Diesel. I haven’t used them personally, but they sell these harnesses at a lower price. Hope that helps.
Fallon said:
Alliant makes them.
Thanks! I’ll check them out.
Alliant makes them.
My brother and I installed a cheap, Chinese-made harness on my truck. It looked well-made and has been working fine so far.
My brother is a diesel mechanic with decades of experience working on fleet trucks and heavy machinery. When I mentioned my concerns about the harness, he said, ‘The Chinese are good at copying parts. Most problems blamed on aftermarket parts are usually from bad installation or other underlying issues.’
@Terry
It’s not just how they make it but the quality of materials they use. I’d recommend going with Fomoco so the connectors don’t degrade, and you avoid issues with pins rattling loose.
The original harness lasted how many years? Spending a bit more for another one that lasts just as long seems worth it.
@Glenn
The truck has 340,000 km, and the motor was refreshed with a low-km bottom end 40,000 km ago. From what I know, the harness is original, so it’s probably due for replacement and is likely part of the problem.
