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  1. Mogman

    HMMWV in limp mode no trans light

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

    HMMWV in limp mode no trans light

    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...
  3. Mogman

    HMMWV in limp mode no trans light

    You need to find the reason you have no light before worrying about any sensors or trying to get codes.
  4. Mogman

    HMMWV in limp mode no trans light

    You should get a trans light when the run switch is put in run but the engine not running. If you don't it is ether no power to the TCM, a bad trans light/wiring to the light or a bad TCM, that has nothing to do with any of the sensors. There are two sources of power to the TCM one continuous...
  5. Mogman

    HMMWV in limp mode no trans light

    This is what you needed to troubleshoot the power issue to the TCM, it is unfortunate you did not start with this before randomly swapping all those expensive parts.
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