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You may have a grounding issue, are you running ALL ground leads involved back to one of the vehicle grounding points or are you using the body/frame?

Welcome to the SS forums!!

Welcome to the SS forums!! I always remove the complete ass so I can fight it on the bench.

Antifreeze sounds like a possible catastrophic failure of some type, like a rod came loose and busted the block, was the cooling system full? I would be tempted to drop the pan and have a look see, also inspect the sides of the block carefully, unfortunately antifreeze in the oil is always bad...

Is the oil over full? you just need to let a little oil out of the pan to see if any water is in there. It is also possible the IP is seized, you may want to pull the top off the IP and see if there is any sign of water, but I suspect you would get a little movement at the front pulley. If the...

In what TM did you find those instructions?

I think on that engine you can take a 1" open end and grab the "spokes" on the front pulley. always try to turn the engine in a clockwise direction looking at the front of the engine. Was the intake filter pipes intact? Crossed fingers that it is just a bad starter or something else...

Welcome to the SS forums!

I re-wired the truck from the tail lights to the headlights and everything in between.

Here is a link to the build, I believe all my pictures are there. https://www.steelsoldiers.com/threads/how-not-to-install-a-duramax-in-a-m998.199340/

You need to read the resistance, it should be around 2.5 ohms, would look like continuity on ether a meter or a test lamp. The solenoid certainly could be shorted though.

What trigger are you talking about? You can connect the batteries without the PCB connected and run a test wire from the solenoid where wire #74 was connected and try touching it to the hot terminal wear a face shield and gloves

Can you connect the cables with the PCB disconnected?

One thing to consider, if that wire #74 was pulling all those amps it should show signs of melting, disconnecting and verifying is a good plan.

The wire 74 (pin I) will show very low impedance (resistance) to ground. I just measured one at 2.5 ohms If there was a short between positive and pin I it would try to kick the starter in when you connected the battery and would certainly cause a flash.

Welcome to the SS forums!! The most common things that can cause this are: Stuck check valves, if they have not already been removed then do so. Bad lift pump. plugged pickup sock in the fuel tank. When was the last time you changed the fuel filter? With the engine running if you crack the fuel...

Some radial movement is normal, the oil on the bushings is rather thick when cold and there is not allot of mass there so all that sounds normal IMHO.

Port Aransas TX

I think it would be next to impossible to keep that screw from leaking, was definitely an unwise move. The early TCM should serve you well.

Yes I think it was United Parts Service, it has been many years, 25 or so.