I recently purchased a 15ft Beachcomber
, and am in the process of trying to resolve an issue with the tail lights
and running lights.
When I first started reading your post....bad ground came to mind. But you have already looked into that. As all your lights seem to be affected I would lean more to the main ground. It could be the tug or the trailer with the problem. Some trailers ground through the ball, not the best. Using one battery
jumper cable between the two would show if that is the problem. Don't ask how I know that and it's a quick easy check. If that didn't show any difference I would start checking all the connections from the plug to the trailer. Being your getting some light
from everything the connection is there but something is loose or has corroded enough to not to give you a 100% circuit.
Rereading your post it reminds me of the differences to wiring the plug to the tug. When I went to pickup my Casita
I had a round 6 pin on my truck. I made up an adapter from 6 to 7 pin for the trip home. After hooking up I had all the outside lights flashing too with the turn signals on but they were bright, OK, ground was good but...I disconnected everything in the adapter plug except the ground and with my wifes help tested each wire in different points until I had the lights working. There are two different wiring configurations, Bargman is one and I can't think of the other name now but they don't interchange. Good luck to you but do the jumper cable first as it's a quick test.