Wired 'er up and all is working properly
For anyone tackling this in future:
Driver's (left) side:
grey w/yellow = brake light
blue w/green = turn signal
grey w/purple = running lights
On passenger (right) side, all you need is the blue w/brown for the turn signal.
My 1M w/trailer is now ready to make its debut next weekend for an event at Summit Point.
Neil