I have a 1988 29' Excella.
I put it up about twelve months ago with all lights working. Today I brought it out of storage to sale and had no lights, running, brake or turning.
Having restored a 68 Globetrotter I understand about mice etc.
But when I check the plug from the truck using the plug's ground, all lights work.
When I apply 12v
to the trailer plug using the trailer plug's ground, all lights work.
I have even hard wired a wire from the truck frame to the trailer frame and no luck.
Honestly, I don't really know where to start. Suggestions?