Really?
I have a Fleetwood RV and installed my brake controller, a 7 pin wiring plug, and hooked it up to my brother's trailer in about 2 hours.
And then I found the running lights tripped because the 18 running lights on my motorhome + the 14 on the trailer tripped the 20 amp circuit going to the headlight running lights. Unhooking the trailer, I found that I have only 9 volts to the rear brown wire (the one for running lights) and installed a 12 volt relay (thankfully had one sitting around) to power the trailer plug running lights from a separate 20 amp circuit (wire I had already run for the water pump directly from the coach battery bank).
I guess I had it easy already because I already had installed a purple wire between the brake pedal and turn signal, and it was hooked up to the rear of my motorhome to control my toad braking system. So I could tie into the brake light easy. And I had already installed some 12 volt accessories - hooked up to the coach battery below the dash, so I had a 20 amp circuit for the brake +12 power.
At the back of my RV, years ago, I installed a power strip. So the green, yellow and brown wires where connected there, and I was able to quickly connect another wire to the new plug.
Good luck,
Fred.
