The wiring on the Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies - 5.2K to 7K # AKEBRK-7-SA will be 10 to 12 gauge. I prefer the Deka 10 gauge # 10-1-1 (sold by foot) paired with the Deka Heat Shrink Butt Connectors # DW05745-5 to complete the install.
As a side note, with both wires being black, either can be the power wire. It is always a good idea to ground each wire that is not used to its own specific source as well. The Ring Terminal - 3/8" Ring... view full answer...
On the shank of the Blue Ox weight distribution system part # BLU36FR that you referenced the distance between the hitch pin hole center and the adjustment hole centers is 9 inches. view full answer...