Hadn't thought of testing with a battery! Great idea!
So on the 7 way plug I should attach the trailer wires as follows:
* white to ground
* 2 brown wires go to tail running lights
* yellow wire to left turn and brake
* green wire to right turn and brake
* 1 red to brake controller
* 1 red to reverse lights
The trailer has surge brakes.
Assuming that the two (2) red wires are for a brake controller and reverse lights, will it matter which of the terminals I attached those wires to in the plug?
Or, can I just put the 2 red wires together and connect them to the reverse light terminal on the plug?
Appreciate your time and help! Thanks!!!