I have a short somewhere? How do I find it?

RoyB wrote:
This is not a bulb problem but a wiring problem. The two wires feeding a light fixture is shorted somewhere. Find where two wires feed a light fixture and then break (CUT) those two wires loose. i.e. two wires from the fuse panel will go to a light fixture close to the fuse panel then it will connect to two wires going to the next light fixture, and so on and so on. This is what I mean by daisy chaining... One of those cables is shorted together or to frame ground. The dark color wire will be +12VDC and the solid white wire will be frame ground potential. The fixtures should not be using frame ground connections but actually have a path all the the way back to the fuse panel for the NEGATIVE potential wire. i.e. both +12V and -12V feed all the way back to the fuse panel.

You want to disconnect each of these wiring connections and hopefully can determine which leg is shorted.

Not a easy task here as all of this was put in place before your ceiling was installed... The only holes you can look in are where the light fixtures are mounted. My space between the ceiling and the roof is full of foam... No way can can I pull any wires back or even see any of the wires except where they come out to wire into the light fixture...

In the end you may have to abandoned the whole thing and disconnect the two shorted wires from the fuse panel and run new wires the best you can to each of the fixtures. The wiring will be daisy chained I imagine. So if you can find the shorted segment that would be the place to cut and abandoned the wires.

In my TT trailer the air conditioner ducts run the whole length of the trailer and is a path cut from the foam for cold air to move thru. A perfect spot to run new cables...

I guess alot of screws went into the roof from the top...

You might just want to take it back to who ever put the new roof on and tell them to fix it for you... (of course that was probably you that put the new roof on haha...)

Roy Ken