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Thats awesome! Thanks for posting up the solution. Your follow ups with testing made it easy to help. I predict others will find your post helpful. I know I did.

I'm not sure if you can swap or not. Ive never needed to do it yet. I Looked up the TCM in the -387-24P manual and it shows a different PROM chip for each different year.

Voltages at the batteries and generator within spec? Same light results when the wires are switched to the T/C lamp? If so, it sounds like there may be stray voltage backfeeding through that wire. Anybody else got any ideas on this one?

Hmmm....check the voltage of each battery individually, then check for the voltage of the pair, then check voltage at the batteries while running(generator output). Lastly, check voltage at the 12v stud on the front of the generator. This is probably the stuff to check first in any electrical...

Looking at the schematic from the TM 9-2320-387-24-2 for the M1114 sheet 2... The light should get 12v power from the transmission relay directly to wire 657B. Wire 657A then goes directly to the TCM housing cannon plug terminal U then thru to the TCM module pin B9 (check trans lamp). Im...

My understanding is The red button is more like a reboot button than a circuit breaker. The dim light may be a clue. I would check/clean the connectors to the light that are located under the floor in front of the shifter bag. Another possibility Ive read about is stray voltage from a failing...

A basic shifting diagnosis will be hard to pull off if you cant get up to 45MPH at least to catch OD and converter lock up bumps. Does the trans shift into all four gears while in OD position? When manually shifted from 1 to 2, 2 to D, and D to OD, does it shift as commanded? Can you feel the...