Harness/PCM problems-2005 6.0 engine into an early build 2004 F250

[jrdeisel]

My truck is an early build F250 SD 6.0 (built in Aug 2003). The engine blew, and I bought a 6.0 from a 2005 F350 drop-in complete with harness (but no PCM).

I was told "no problem we do these all the time-the 2005 harness will plug right in to the 2004 PCM".

I have installed the 2005 engine, and when I went to plug in the harness, I now realize the harness plugs on the PCM side are totally different. There also are quite a few different pins within engine-side plugs too, but those plugs are at least the same shape.

So, my questions:

What do I need to do to get the 2005 6.0 wired up in an early build 2004 truck? I have the 2005 harness, but not the 2005 PCM.

Should I use the 2004 harness on the 2005 engine, or get the 2005 PCM and use the 2005 harness on the 2005 engine?

If I change out to a 2005 PCM, will it work with the remainder of the 2004 wiring?

Also, does the FICM that came with the 2005 engine need to stay on the 2005 engine, or should I put the 2004 FICM on the 2005 engine?

Or am I totally screwed?

Thanks for any help on this! Snow's coming and I need to get this beast running.

Jim (feeling like even more of dumbass than usual)

[m-chan68]

You should've gotten another engine from a 2003 or early-build 2004 truck. The questions you are asking are moot now. Get rid of the 2005 engine and wiring, and get yourself a 2003 engine to avoid any more headaches than you already have, at least if you want your truck reliable.

[dannyboy950]

Shure wish ya had posted before ya got involved with that project. From personal experience I woulda said don't do it. More hassel than its worth. I built a similar beast,03 block 05 top end had to swap timeing covers.pan,oil pressure regulator etc. I was at least lucky I had the 05 wireing;PCM and FICM. But for the labor involved I could have got a crate engine ready to go and had change left over.

[jrdeisel]

I have found a used 03 engine coded DG-042-AC, but mine is DG-042-AF.

Will they swap? If not, what would need to be done? I have the complete old engine

[m-chan68]

Originally Posted by jrdeisel

I have found a used 03 engine coded DG-042-AC, but mine is DG-042-AF.

Will they swap? If not, what would need to be done? I have the complete old engine

Yes, THIS engine will work. Sorry about your luck.

[jrdeisel]

Thanks for your advice!