Wiring from RV 7 way to Toad vehicles existing lights?

Here you go fireman, try this link to see how it should be wired. Remember that in DC circuits, RED is usually Batt. The schematic has the correct colored wires to use from the RV to the lights of the towed vehicle, trailers and car dollies. This is a nation wide standard, not code or law but, voluntary standard.

RV to Towed lights wiring schematic