Question Diode in Brake Light circuit

[Joe Hogan]

Regarding the tail lights of the Tow vehicle, the set we are using disables all battery power in the vehicle, ie battery interrupt solenoid. The tail lights will then be powered by the RV power system using same or parallel circuits to the vehicle light circuits.

When the car resorts to self powered, no RV attached, what keeps the trailer wiring from being powered by the vehicle battery? Diodes in trailer wiring blocking back flow of current?

 

[Joe Hogan]

Researching this some, looks like the Blue Ox and others isolate the two systems, Vehicle and RV, with their kits, using connectors and diodes. Interesting systems.

Way ahead of the systems I used way back when where you had to cobble together parts and wires, crossing fingers the magic smoke did not escape.

Live and learn

 

[JRS]

I used the Roadmaster kit which also utilizes the diodes. Prior to picking up our rig at the factory, I was able to plug into a friends pickup to check if the lights worked.