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My thoughts on that are: diesel and water stay separate, so it doesn’t seem likely that the salt that is dissolved in the water will jump across liquids. However, whatever the water comes in contact with, say for instance the bottom of the fuel tank, will be subjected to brutal corrosion. All...

Suggest you pressure wash this truck stem to stern twice. Then spray components like the engine computer and alternator with something like WD40, there are better sprays available for protection however.

I would check out that 3 switch remote start panel in the engine compartment, maybe the switch is full of salt water allowing continuity all the time.

Lets Be Complete Doofuses is basically what S&S and Leece Neville were thinking when they put that system on FMTVs. Load Battery Control Device

My opinion is those solenoids are damaged by salt water. Bypass them for diagnostic purposes.

Have you checked the two solenoids tied in next to the master disconnect switch?