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A reliable 25yr old military vehicle? I would sell it now...LOL HMMWV "High maintenance money wasting vehicle"

Is the t-case in neutral? i frankly don't use green labels, they don't require a TSU in the water crossover, all the other EESS's do...find a yellow label or S3 EESS. TSU Won't make it smoke, at least I've never seen one do it. check all your plugs too....

Hope it works, buy I'm sticking with bad control box...

Those are all fine..95% of the time, you can visually see that the plug is toast. you will need an EESS and TSU to proceed...

No way to test...but the signs of a bad EESS or older PCB is either a quick flash of the wait light and nothing, or a constant flashing, at the same time as you pointed out, no fluctuation of the voltage gauge showing the GP's are drawing voltage. that is for one or both reasons...the box is...

It's really not an option, as a mechanic for 30yrs and a Communications Engineer...all the trouble shooting in the world won't make up for doing what we called Black box change out... many moons ago we diagnosed to the component, these days that is time consuming, that equals time and money. So...