Brake box bracket under the hood - it will activate the trucks brake system when the motor home brakes are applied — not much room under the hood for extras - bottom pic shows finished. Bracket using battery strap mounting bolt - covered with industrial Velcro and flex rubber tape under so I don’t rub wiring
I ended up in a conversation with tech support and the brake unit has a air pressure switch that sends 12v and use that for my monitor led power source. He also mentioned the possibility that the system might not even throw juice on that wire when shut down in tow mode . I will have to check — unit is working -