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If you have ever seen old videos of the Belgian block course at Aberdeen Proving Ground, you will understand how this truck can perform like this. During trials, trucks have to take this kind of abuse with 5 tons in the bed.

Lots of potential there. No telling what kinds of now banned pesticides and herbicides that thing sprayed. I never use respiratory protection when using a cutting torch, but I would if cutting on that. I don't recall the M16 having a double frame? Engine is White 160AX. Take a look at...

Nice truck, but nicer trailer! Who does that belong to?

I think it's transmission harness issue. The rain got into something.

I would re-seat all the connectors related to the Allison. Behind the dash, the one at the left front of the engine under the cab, and the ones at the transmission. Look for chafing on the harness.

DNS is do not shift (the TCM that is, not you)

P0880 Disappearance of power supply control unit during operation engine P2685 Low voltage in the circuit HSD3 P2812 Open circuit solenoid PCS6 Incl. DNS, SOL OFF...

Codes mostly related to voltage issues in TCM. Do you have a way to google the codes? I think the WTEC is inhibiting crank because it feels really sick.

How about pull codes on transmission? Press up and down key at the same time and report back.

Voltage too low!! <- Retract that, voltage is OK with alternator not outputting.

Is "MODE" lit on the trans controller?

Is that called a spelter socket?

I don't think this has been discussed. We all know FMTVs apparently can run and drive with water to the top of the cab, from that infamous National Guard utube video. The TM says 5 feet WITH exhaust pipe extension. Who has ever seen one of those? How deep WITHOUT extension? Any opinions? I...

Welcome. There is no proportioning valve. Your steel lines are plugged with goop. Plan on replacing them.

Now you know why Uncle excessed the truck. Nobody had days to spend chasing this issue. Should be fine now, you can operate it normally.

Sounds like your pin is not there. I have done this adjustment a few times, and the pin is always there bobbing around as the engine runs.

If the LBCD checks out, next downstream is the power distribution panel, which was soldered with RoHS solder and is subject to intermittent connections.

The device under the spare is called the LBCD (Load Battery Control Device). Search that term under the FMTV forum will bring up what little is on the internet about that device. A post by suprman has a schematic.

Bypass it, it is intended to protect the circuits in the event that the batteries are hooked up backwards. I think you can "double lug" the cables on one side of the device.

Look for a device with heavy cables going in and out. It has been known to have intermittent connection issues.