Its ALIVE!!!!!!! Diesel engineer from work came over today, we added coolant, checked the oil (brand new - still light amber color), checked all of our connections, and gave it a final once over.
Dead cranked it a few times and everything sounded good, no abnormal mechanical sounds at all. Went to prime/run for a couple minutes, went to start - nothing. Just a clunking sound like something was dragging the batteries down so that enough current wasn't getting to the starter. Tried that a few times with no change.
Eventually dead cranked it for 15 seconds, immediately went to on with the the dead crank switch, hit start and she fired up like a top. Clear exhaust, smooth sounding, no issues at all. Adjusted voltage and frequency, and measured the output across L1-L3 - 240 volts. Tried the diesel fired hydronic block heater - that worked like a champ also. I'm convinced that the only reason this one went to GL was that someone bashed some of the sheet metal with a fork lift, either that or the fuel tank well nut (drain valve) that was leaking and needed replacement. Has 16 hours on the meter after Letterkenny Depot reset was performed in 2012.
Now I just need to make up a cable to load test it before I go through the hassle of permanently wiring it up to the house.
Thanks to M-35Tom for the info on the well nut.
Anyone have any ideas on why it wouldn't crank when initially taken to start? Is this something I need to look into, or is everything good now?
Thanks for all the help folks, I really appreciate it.