Thanks for the info; when the rain lets up a bit I will get back under the dash and try to trace the remaining mystery wires down.
So far, the remaining unidentified circuit numbers are:
#72 (white) from glow plug relay power out to harness under dash.
#74 (green) from ignition switch terminal #2
#77 (yellow) from ignition switch terminal #4
Once the wires are traced I will post a list of where they terminate.