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There are not wiring diagrams available for any RV trailer I have heard about. You need to figure out what circuit is dead, check the fuse and either trace back from the furthest fixture from the switch or fuse panel or trace from the fuse panel through the fixtures. Begin by removing each fixture in turn. I would start closest to the fuse panel and examine the wiring at the fixture and as much as you can see from the fixture mounting. If you can't see anything first time, you need to pull gently on each wire away from the conector to see if it is broken inside the insulator, this will also reveal any loose conections. From there start running new wire through the wall. Good Luck