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With the 3 hot wires you'll have signal, brake and park/running lights. The light assemblies I've seen were grounded to the trailer frame through the bolts. Our trail tech had a ground stud welded up near the tongue and a black/ground wire running back to the plug.
Does that M101A3 have black...
Trailer wiring.
The new civi trucks I have been around all have the Pollak style connectors so it looks like it's exactly what you're doing.
http://www.pollakaftermarket.com/
http://wiringdiagram.ncracres.com/pollak-7-way-trailer-connector-wiring-diagram/
Once we went flat 7-way on 14...