The pig tail that plugs into the truck is pinched near the swing tongue. I do not have continuity from the round plug that goes to the truck and the other end at the swing tongue. I have verified it's bad. The brown wire is supposedly the running lights. It is shorted to ground or I have continuity between the white wire/ trailer itself and the brown running lights wire. The white wire is supposedly the ground. If I unplug the license plate illumination bulb I no longer have continuity between the brown wire and ground. I'm assuming all these lights are led so am I correct in assuming the license plate bulb is bad? I would think the brown wire is 12v+ and having continuity with the ground is bad. I'm asking because maybe I don't know everything about led lights either. Are my assumptions/ findings correct?