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Thanks for the information, will add to my Upfitter file for reference. Don

The “jumper” refers to Aux switch programming. Have not done this myself, just using term from upfitter info sheet. I’m assuming someone did it for switches 1 & 2 because I don’t know another way they could have become B+. If I need one of them in future will have to follow directions to make...

Thanks for the responses. After systematically excluding other drains at TIPM with a sensitive DC ammeter, we noticed that two of the five “upfitter” switch circuits had somehow been jumpered so they were “B+”, on with key off. Don’t ask me how I hadn’t noticed this before, just wasn’t informed...

At first this seemed to be a bed light that would turn on spontaneously, and we disconnected the LED circuit connections at the light curing that part. But the dying battery problem either continued or resumed (thought cured for a few weeks but don’t know if “tested” so am unsure of that)...

Our dealer kept truck two weeks, driving it, and problem did not occur. They asked me to leave the Edge Insight disconnected from the diagnostic port, saying sometimes having anything connected there interfered with communication among components (on the CAN bus, or ???). I drove an hour home...

A. We still have 2 years on the premium factory warranty, so it's a $200 deductible to us for now. B. All the key HVAC, seat heat, etc etc controls are on the "radio" screen, so it's hard to get a divorce !! C. The continuous tire pressure display I especially wanted is in that EVIC display...

Amen to Grumpy’s comment! Sam: it occasionally is on startup but mostly random while driving.

The current status of my issues with electronic displays is different than when I initiated this thread. Now it is intermittent, simultaneous failure of both the radio screen and the central digital EVIC screen between speedo and tach. The analog-looking gauges like those, temp, oil pressure...

The diagnosis turned out to be one loose pin in that same connector behind the driver's front wheelwell liner, the connector that the dealership mechanic and my own mechanic friend had carefully checked and found no loose or displaced pins, previously. Do not know pin number. Repairing that...

Update: Very positive conversation with service manager at Dick’s Wilsonville CDJR. Scheduled with his transmission specialist in 2 weeks. Understood that consultation with Ram or Aisin specialists may be needed, after we get the basic thorough diagnostic tree done. Cautiously optimistic...

Thank you very much. Longer reply by PM. In one sense, this is “rocket science” even though it shouldn’t be. Don

Agree with the argument for simplicity, and caution about harness replacement unintended side effects. I hope to learn about the sources of advice from Aisin and FCA in the case of the Texas owner, so as to understand the situation and resources the best I can before we launch the next try. If...

I found Dave Smith, Austin TX area, who posted the above about his wiring harness replacement, on LinkedIn and messaged him asking name of dealer and any details he can provide that would help them resurrect information that might help get the same attention and FCA/Aisin consulting advice for...

And another forum and thread even more on-target. Given the attention we have already given to connector I 255, this man’s experience sounds much more likely to match mine. I will try to communicate with him on the Cummins forum and find out where/what dealer was involved. Here is the key...

Finally stumbled on someone with probably same issue on another forum: https://hdrams.com/forum/index.php?threads/i-255-connector-issue-aisin-transmission-goes-into-limp-mode.12881/

Tuesdak: We found 2 other connectors in that area, also checked and OK. Based on your advice (which rings true with my old experiences with pins on another truck) I will have them do the pin replacements for the I 255 connector (ID for it from sag2 post above) whether they will cover it as...

We re-inspected that connector and it was in perfect condition including all pins, clean except road dust, not the tiniest sign of oxidation or corrosion. Used CRC QD contact cleaner for good measure and dried before reconnecting (De OXit hasn’t arrived yet, but I don’t think that will be the...

Sag2, thanks. That is a good suggestion. Believe I have some DeoxIT on hand already, and a good fine detail magnifying glass for such a job. Would it be heat coming off that LF tire in hot day driving, radiating to the wheelwell liner and then the connector, that would account for the...

Thank you. That is the connector that I paid the dealer to inspect, and mechanic said no problems with any of the pins or any other problem found. Of course he could have missed something, we can't discount that possibility. What I hope to see is someone's hypothesis for how hot weather towing...

Thank you, will do that. Ironic we avoided it by keeping one battery in place while swapping both. I appreciate all the responses. I still hope to see a reply from someone who has been through this specific symptom complex and found the answer. And if the hard reset doesn’t fix it, I would...