OK. I do believe I am functional now. I got a rig terminal and tied the white to ground. The black went to battery power and blue to trailer. I tested black power with pin in. Gets a red light. I pulled the pin. The box itself lights up red. Seems like a good thing. I test the black power power with pin out and no red light. Sounds like I am good. Final test I imagine would be to pull the pin and pull the trailer? Someone told me to do that. But I am not sure if that would damage the brakes? Maybe just a slight tug?