7 pin provides 12v from your tow vehicle
Etrailer.com has wiring diagrams for all different plugs. The 7 pin provides 12v direct from your tow vehicle.
Tested my RVi Brake 2 today using the RV remote as an actuator. Happy to report it works well, no problems, no key in the ignition. Getting closer every day.
Nick, Sharon and Fin the wonder dog.