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I know this thread died a while back, but in case anyone is interested, I just stumbled across the reason a truck in Maine would have come with a glow plug control module rather than a relay:
Originally Posted by Ford Service Manual
"Green States" are states in the Northeast that chose to adopt California emission regulations, starting in the 1998 MY.
At this time, Massachusetts, New York, Vermont and Maine are Green States.
Massachusetts and Maine receive California – certified vehicles for passenger cars and light trucks up to 14,000 lbs. GVWR.
New York and Vermont receive California–certified vehicles for passenger cars and light trucks up to 6,000 lbs.GVWR.
It was nothing, really; I wasn't even looking for that. I just happened across it while looking for something else and remembered this thread. If it ever pops up again, hopefully someone will remember the info is here.