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I guess that answers the question about if you were in limp mode, you might want to step back and do a thorough inspection as honestly you should have put eyes on that before you went for a drive.

Look at the picture in post #20 and match it to the schematic in post 22, you probably cannot do it wrong as you have 2 male and 2 female connectors and it looks like it really does not matter what polarity the coil and contacts are connected. Probably the breaker also

This is a cool looking rig, does anyone have pictures of the inside? any history?

I would be shocked if GP would take the time to install and then remove batteries.

It should be quite obvious if it is shifting or not, when in limp mode it would seem to bog a little on takeoff (starting in second instead of 1st) and then it does not shift, thing makes too much noise not to notice when it shifts.

Do you have a lit trans light when you turn the ignition to run? If not it is likely your TCM is not getting any power.

Also is does not sound like you are "coasting" the only time you coast in a HMMWV is occasionally downhill. Could you mean while cruising?

I think you may be running in limp mode, again is the transmission shifting? no real difference in the turbo, horsepower difference is very marginal.

That is the fan kicking in towards the end of the video if that is what you are talking about, it does also seem to be running quite a few RPMs for 50MPH. Is it shifting or are you running along in 2nd gear?

Maybe so you will not fry your glow plugs as you repeatedly cycle the run switch, just a guess.

The TCM gets power from more than one source.

I had my NAS crash so I cannot locate the supplemental troubleshooting guide, I think I have posted it for you before. (someone?) All you need is a piece of wire to get the codes. If you have no trans light you ether have a bad light or you have no power to the TCM, a bad TCM, or something in...

https://www.steelsoldiers.com/threads/hmmwv-technical-manuals-if-you-need-it-its-here.189594/

What codes are you getting???

Yes they should be low ohms, if they test good there is no reason to mess with them.

To answer one of your questions, you want to try to pull them before using the extractor so you want to unscrew them first, as RWH and others said lots of penetrating oil and patience. Have your glow plugs tested bad?

The best reason for the quick connect, which do leak sometimes is to make it easier to change belts, only you do not need to disconnect the hose to change a serpentine belt which appears to be in production about the time they started installing the quick connects, would be handy for V belts...

I agree, there are many folks here with awesome talents.

Do the dash lights go out when you try to start it?, if you have something close in front of the truck turn on the head lights (if the batteries/battery connections are even good enough to burn the lights) , watch the reflected light and see if they go out when you try to start it. Are these...

I am curious where you are getting the core?