Jacksbrokengarage

Thank you so much for the response. Truck was running fine when parked. Originally parked as it was needing paint, never for a mechanical issue. It has been parked in the garage/driveway for the past couple of years as life got away from me. Last started and ran (with gauges) roughly Sept.2024. Before then, arguably the most reliable vehicle I own. Over-voltage is my novice speculation as some signs were alleged by the PCM rebuilder. Their notes were as follows: "We found your computer had an old power supply which was not creating the correct voltages.There was also some small physical board damage that needed to be repaired.The tech replaced the power supply, capacitors and voltage regulators. The computer is now fully functional and responding properly.Common to fail circuits were also replaced while we had the computer open on the bench to prevent future failures." I have been trying to trace off of a PCM diagram from AllData that a friend who works at a shop provided me. Other online forums have directed me to try unplugging different sensors. I found mopar1975man had replied to just about every forum around, and figured this would be the place to try. I have checked every loom and wire I can see. How well I checked them is hard to say. I did not find any signs of rodents, and no obvious rubbing. Truck is fairly clean, no blown fuses, and little to no corrosion issues. Never driven in winter or snow, no salt. I have some of the interior apart for a separate project, but have no clue if or how that could be related. Please let me know if I am missing any other helpful details. Kindly, Jack

Hi All, Dreaded issue I'm sure everyone has heard about. I am hours in to diagnosis and unsure if I am even on the correct track. Please excuse any ignorance or missed steps, I am doing the best I can with the limited skills I have. Backstory - Truck sat idle for a few years. Runs great. Tachometer is the only gauge that works. I have the "Wait to Start" light. PCM was sent out and rebuilt, signs of over-voltage. New alternator was put in, and the in line fuse protection from this forum was installed. Went to start the truck and I briefly saw the fuel gauge work with key on power. Grabbed a new battery as the old wasn't enough to crank and I am back to the original issue again. Alternator is not charging. I have checked and wiggled all PCM Connections, did the dash test sweep, checked passenger side grounds, unplugged abs, oil pressure, ac, and every other sensor I can find on the same system. I checked the white connection box under the clutch pedal. I am lost. OBD shows a code for the communication error. Dash has 920,921,999 codes. I don't even know what to check for the next steps, but I am not giving up on the thing. Could I have blown my rebuilt PCM on the initial key on start? Thank you in advance for any advise or guidance. Jack