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Yep, same data plate, my truck's vin: 05D78771 C13710163. I think they're cousins. Also source a spare battery switch. Simple R & R. And trouble shooting.

Ajax, Your observations are pretty typical of these old trucks. "Nature of the beast". The "dead" battery switch is very common, it 's issue resides in the PCB. Old relays, just cycle the batt switch until the volt meter come alive. My 925 has that issue occasionally. As for the primer on the...

-Add this to your list; SCA (supplemental coolant additive). Head to the big truck parts store and get the test strips and a bottle of SCA. The engine coolant needs a specified PH level to prevent corrosion to the internals/sleeves. Your engine (NHC 250) is susceptible to this type of damage.