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So you dont have the old harness ?

😉 they last a long time like that when you don't put them through the paces (and that's a good thing) Back with the dirt bikes..... if you didn't have a Bel Moto 3, you weren't cool.

Guys In my younger days ............ way back when My ol man was saying wish we had some good gear to useto cart D9s etc so I wrote a letter to all the main truck & low boy makers requesting info a few replied and some sent b&w 10 x 8 photos this is how I had the GMC / Fruehauf dump body pics on single wheels & the B model Mack from trailer makers Thanks for tour interest cya

This is a little out of my experience, however I know someone who posts on a different board, He repairs "lightening strike" vehicles. One thing I picked up from him, that one bad module can pull the whole Canbus down giving the impression that everything is "dead". Once the one the one thing that is killing communication on the bus is disconnected the rest can come back to life. This requires locating where they are tied to the canbus wiring and removing one by one, until the bad one is found, re connecting one by one to make sure you don't have more than one. He also says to check the resistance between the hi and lo buss wires and look for a set resistance (150 ohm?) I'm not sure about the resistance I could check with him if you get that far. Higher is an open somewhere and lower is something on the buss is shorted.

Ok that a little different… other guys might chime in to recommend a perfect set up good luck I ran freight trucks all my life mostly single axles so I’m not familiar with what would work for you… good luck … bob

appreciate your perspective. I should say that this is not a truck that I'm going to be using everyday. Farm application (building roads, etc) and occasionally out to a job site but not my every day rig. o.

I agree that it could be wiring related, I spent some more time with the truck trying to figure out what’s going on. The engine ecm is definitely offline, it won’t communicate with the laptop. Power and ground leading up to it seem fine from what I could test with what tools I had available to me. As much as I hate to “parts cannon” a truck, I think I’m going to try replacing the engine harness. It still needs an ecm though from what I can tell. I already took the ecm off, I’ll have it tested and repaired tomorrow if all goes well. Could someone please get the the correct part number for the engine harness for the truck? 2012 GU713 MP7 VIN: 1M2AX04C5CM011802

Looking for new or good used engine harness P/N 41MR5864M or 25502503. What have you got?

A growing number of both Republicans and Democrats are talking about deporting ONLY violent criminal illegal aliens. Some are talking about granting an amnesty “pathway to citizenship” for non-violent illegal aliens. Why ??? https://www.breitbart.com/crime/2026/01/30/swamp-rivals-join-to-sink-trumps-pro-american-migration-policy/

anything that old for sale is usually beat to hell,,and wind up on a hook half the time and nickel and dime you to death,,,if you insist on older low mileage i would start checking state sales,,,,most of thier stuff is low miles well kept up and reasonably priced,,,good luck,,bob

It’s not uncommon for bad wiring under the valve cover will shut down cylinders and werid stuff goes on! A place to look! just sayin

You know it was 54 years ago. I had a bad accident was nobody’s fault but my own I was speeding just got my learners permit car pulled out in front of me was not his fault. I tried to avoid the car. I ran into a three and got knocked out. Helmet was all scraped up when I came to completely ruined my 66 Honda 90 and I can still remember that car that turned in front of me don’t know how it was around a 71 Ford wagon light blue I don’t know how I remember that but I believe it was a bell since back then that’s what everybody was buying hell it was so long ago. I’m surprised I even thought of that since I’m getting older and senile.

i still have my bell full face helmet around here somewhere. over 50 years old now.

I guess he needs to unplug the E.C.U.'s and check for continuity on every pin to every other pin in each plug end. when he finds continuity, then he finds the 'short' This is tedious, but so is paying thousands to buy ECU's only to cook them. Im seein the Vehicle module and I think the injection control module are faulting. What is the ICM, again, I forgot.

repeated bad ECM's with comm codes would have me looking at the wiring harness also. My guess is something is cross shorting and frying communication. Going to be hard to find.

Ecm plugs are completely dry, I did injectors on this truck not that long ago and I saw oil in the connectors for each injector so I figured it was on borrowed time for a new engine harness, but no there’s no oil or coolant that has made it yet to the ecm connectors.

Any chance you might have antifreeze or oil wicking into the ECM? That was an issue on the E7'S some times

already ran out of likes....i rode for years ladda lotta fun on them sold my last one 7 years ago to a buddy of mine too many stupid people here now,,,the bike is now in montana

I totally understand that and I understand a shop not wanting a truck to take up space trying to source parts. It just would of been nice for someone to at least communicate with me rather than say they will try and then I never hear anything from them. I understand that lack of communication was from shop management and not the mechanics themselves. When my engine was down I lost about a month waiting to hear from any one of the shops. I was just intimidated by the size of the job I was looking at and unsure about what I was looking at. Once I got into it it was all pretty much straight forward and didn't have any problems, except time, in sourcing parts. The machine shop I had do my head work also had no problems sourcing what he needed. I was luck on the head being it wasn't cracked. That one I wasn't able to locate, but once the machine shop informed me the head was magi fluxed (not sure on spelling) wasn't cracked and was rebuildable I stopped looking. I did find a couple of heads but they weren't maxidyne heads and from what I could find wouldn't work.

I used Bell helmets. The last bike I had was an LTD1000 Kawasaki. I sold it and bought a pickup truck, mainly because my wife wanted me to get rid of it, but I did need a pickup. I let the full face Bell helmet go with it and the guy that bought the bike only had it a week or 2 and wrecked it. Not his fault, a 4 wheeler made that left turn in front of him when he was coming from the opposite direction. The guy on the bike hit him right in the side. Put him in the hospital for weeks. My wife saw him somewhere after he got out of the hospital and he told her that the doctors told him that the fact that he had a good helmet was the only thing that saved his life.

Good shops are often booked out several weeks and give preference to their local customer base, and bad shops, well why would go there. I can't remember who recommended United, it might have been the truck equipment shop that built the DOT plow trucks (whose name escapes my memory right now). Edit: The truck builder is now call "Reading Truck" 4400 and Calif. changed its name or sold, That is why nothing "rang a bell" when I went looking for the name.

i did notice all this unnecessary over coverage in ice operations,,are not helping our stocks what so ever ridiculous

Just trying to help. In my case, I had the part numbers in hand when I called them for my Rockwell QAR rear pinion seal. Still not a slip in by 10 am and pick up the same day deal. I layed over in a motel and they came and got me. I am all for doing it myself and most times I do, but somethings can't wait or at least shouldn't if you are talking a trip of over 1000 miles. Yes, I have come across "mechanic's " that do more harm than good. These guys did what I asked, and while not as quickly as I would like, the workmanship was acceptable.

They were one of the many I contacted about the engine work. Talked with about a dozen shops big and small. They said they would get back to me as far as sourcing parts etc. All me if they could find parts they were 6 to 8 weeks out. Never did get a call back from anybody I talked with. All shops I talked with even on the brake job as at least 4 weeks out. If it's a job I can do I'm not waiting that long for something I can do in a day. I have no problem getting my hands greasy. I just get the impression from the shops I talk to they have no interest in working on a 40+ yr old truck. As far as the brake job I did pick up a dollie from Harbor freight and modified to to support the hub with the inner wheel still on and once I had it so that it would slide on and off straight the job was basically a piece of cake. The only delay was I had to have the shoes relined being new shoes weren't available locally, but that only took a day. Not too many parts for my truck are available locally and unless it is just a generic parts that doesn't require a VIN number to look up, I have to go to the dealer because everybody tells me that my VIN number isn't a good number. My older parts guy, been with Mack for 30+ yrs, there has no problem. The newer guys need to be shown how to look up my VIN. I do appreciate all you are passing on to me and I'm not too proud to not accept criticism and or suggestions/insight

Re-powers were a bigger thing in the 50's and 60's. Once engine longevity caught up and surpassed chassie life, they went away. Through the late 60's IHC's inlines heavy sixes could be inframed (dry liners). It wasn't just the vehicle mfg that were into that game, Herc and Conti, Buda and the diesel engine makers all would do retrofits. You can see ads back then in places like CCJ for retro-fits. I knew a guy who hauled Ford cars out of the assembly plants, so they had to have Ford trucks. One of his buddies retro-fitting a RD IHC under the hood to replace the Ford powerplant that crack the block.