CAT C15 /6NZ trouble continues

In my previous post , after numerous attempts at fixing my stumbling i thought i had it all fixed, but nope !!
Now, i need some help.
My 2003 Pet 379X 6NZ 18 speed is popping and stumbling still. After more than $23K into trying to fix it, i now have isolated the area of the problem, and its wiring. Truck wash a few weeks back had my horse violently shaking/ popping and huge power drop for 15 miles or so until it dried up somewhat.
Last week the temp here dropped below -13. I needed a quick salt wash off so popped some coins into the do it yourself freeze my butt off truck wash. Obviously the water froze up quickly but after the wash my truck ran like a dream. Im thinking the frozen wash water made connection on a compromised wire, drivers side, between the ECM and the battery box, but theres a crap load of loomed up wires, big and small, in that area. My problem has always been after i reach about 25 - 35 MPH, prior to that speed the truck runs tip top.
I even went as far as pulling the tranny apart seeing as it was always road speed related, but after 16 months and keeping a tight journal on the symptoms, its 100% wiring related. I need to know if anyone experienced such a problem, finding out which wire feeding what data to the ECM. Does anyone have a good breakdown on the ECM wiring, not the engine side, its the ECM port closest to the firewall, with connections from the cab, thetranny speed sensor, the throttle positioning sensor and so on. This is the ECM side im looking for schematics for. If you know of a good web site for this please let me know, every one i see is either a horrible picture, doesnt show more than a few circuits, or its the wrong ECM. My ECM has 2 ports/plugs on it. And its the port nearest the cab/firewall, as previously mentioned.
I could really use some help here.
Thanks guys

 

The last 6 digits of my VIN # 581689 (2003 Pete, 379 X )
Engine S/N ...6NZ 77772 (yes, the #7 appears 4 times consecutively, which ive been asked numerous times )
Thanks ever so much.
Im an old farm guy myself, worked on anything & everything in the most challenging of areas up to our knees in clay mud that pulls your knee joints out of socket when trying to step ahead. But this engine chug / pop / power drop is a challenge. Soaking down the various clusters of cables/ wires etc on the drivers side causes the engine to react with huge problems or a instant temporary fix wnd smooth problem free running (when i hand spray off road salt etc in -15 degree temps, hood closed when at the do it yourself wash bay outside )

 

Thanks very much. In the process of downloading and printing the files, which is going well. Seeing as you also have access to these documents, etc., would you have information on wiring from the batteries (which is the wiring I hoisted up inside the battery box, roadside, using a balled up rag, placing it under the cluster of battery etc., cables just inches before the cables left the battery box through the port hole in the left rear of the inside of the battery box) When I did this a couple months back, it effected the stumbling problem. All that I basically did was shim over / reposition / move, these cables and wires to see if it had any effect at all, which it did. When coupled with the fact that wash water being sprayed somewhere in that same area also effects my problem (not always, but on occasion it does, once very violently my truck I thought wouldn't make it the 25 miles to get home, but obviously it dried up on my travels and the violent stumbling returned to my regular popping & chugging / power loss.
The shop I use installed a neww power wire from the batteries to the ECM, with no change in my problem. This was done a month ago.
When I shimmed up the cables inside the battery box just before they leave the battery box area, the rolled up rag not only lifter the cables and exiting wires "inside" the battery box, but because these cables are all loomed / zip-tied / taped together after they exit the back of the battery box and this "wrapping" together of these wires that (once they are out the back of the battery box) drop down in a big tied up cluster and subsequently another cluster joins into them down behind / below the battery box. So , by moving around the cluster of cables "inside" the battery box, it also moved the cables and wires "outside and below" the rear of the battery box. So, now I have; A) Moved the cables behind the battery box, which made my problem change, and B) sprayed wash water in the same (and other areas relatively close to) place as these cables. But, being such a huge cluster, and with the truck at least able to work now (it wasn't some many months ago because it was so bad) I would like to narrow down the area, identifying more of the wires that run in this area behind the battery box. If I move the cluster and inadvertently completely break (if that's the case) the bad wire and /or circuit, I could completely disable my trucks ability to go to work come Jan 02nd (when I'm due back on the job).
Any ideas ?
Greatly appreciate your support.
Thanks again, and a Merry Christmas to you and your family