HMMWV in limp mode no trans light

[4x4nutz]

All you should need is power to the TCM and a connected and working light, the transmission could be unplugged for all the TCM would care at that point.
It would be handy if you had an LED test light like this one, it shows green for "correct" polarity but more important it also lights up red for reverse polarity.
You want an LED light for this test so you would not overload the TCM MIL light circuit.
you simply connect the clip to positive 12V, turn on the run switch, then see if it lights up red when the probe is connected pin U (wire 657A) at the TCM J1
This eliminates the wiring to the MIL light and the MIL light itself.

Circuit Tester Electric Voltage LED Test Light 6-24V DC Automotive Car Truck RV | eBay

Tester Light Bulb: This LED test light circuit tester bulb has high visibility and long service life. It can indicate the state of the circuit. The green light indicates positive polarity and the red light indicates negative polarity.

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Thank you Mogman! Got both the 1097 and the 1151 shifting like champs in no time at all!!! Your a master Humveesman!

 

[Mogman]

Thank you Mogman! Got both the 1097 and the 1151 shifting like champs in no time at all!!! Your a master Humveesman!

Your welcome, it was nice meeting you, I am glad I could help!
Nice collection of truck!!