Originally Posted by Zeppo
...I see that the outside trailer lights
connect to the converter. Can that bypass directly to the trailer harness then?
There is no connection between the operation of the vehicle lighting
(tail, marker, stop, turn lamps) and the operation of coach/house systems (interior lights
, fans, etc), other than sharing a "ground" (negative" connection. The wires may be intertwined, and that negative connection may be at the converter, but they can (and I think should for the sanity of anyone fixing anything) be kept as separate as possible.
When I replaced the trailer harness, I ended it at a termination box
mounted on the tongue. Beyond that point, there is no connection between vehicle and coach/house wiring.