CM2350 Crank no start

[Anderzhul]

I've got a 2014 389 Pete with a CM2350 motor in it that got in pretty high water during a recent flood, I started draining the fuel, rear ends and transmission (checked the oil and it looks clean, nothing on dipstick or in pan). got the fuel clean and flushed rears and trans and truck wouldn't crank, changed starter and still nothing, figured out it was the batteries so got 3 new ones and put in it. also manually turned the motor over a few times to double check no water in engine.
Got truck running, ran good drove it around 30 mins (had a check engine light come on while driving it for VGT think it was 641 - but has thrown that code before and would usually go away) and came back, drained the fluids again and re-filled them and went to start truck and it would crank but not start. Noticed lift pump wasn't working and found no power to it. All of the lights work and radio powers up but would show no codes. Also the dash when off shows the mileage but when you turn the key to on it just shows ------ for hours and mileage. Screen above steering wheel shows a J1939 fault.

I started checking fuses again, found a small in-line fuse box in the battery box that had water in it but fuses where not blown so I cleaned and dried it out and changed the fuses just in-case, checked battery connections, checked all the fuses again (changed the 100amp fuse in the box near the firewall since it showed a little rust), checked resistance on VGT plug and it showed 135-137 ohms (from what I could find it should read 120 so i'm not sure if that is an issue or not). I found what I think is a terminating resistor on the ECM side of the motor near the intake and showed 120ohm. I looked up the wiring diagram on quickserve and found the pins that power my ECM found I was getting power on the bottom OEM connector on the ECM.

Took ECM out and to a guy that could test it, he said he couldn't get anything to pull up so got a new ECM and brought it back to him and installed it on the truck today but nothing changed, still j1939. Think I found how to test voltage to the fuses (hook one lead to battery negative and use other on fuse pins) and looks like i'm getting 13v up to the ECM fuse and the other fuses in the panel near the clutch pedal, not sure if thats too high or not though, thought it should read 12v