This article is created to supply some valuable although simple info for the RV operator that was regular to aid them with repairing and determining Electrical problems securely and successfully. I'd advise that you take on the light fitting and examine the rear where the wires join and look for a quick sometimes there or a that is possible build-up in the bulb case itself. Initial thing I'd do is link a lengthy cable to my multimeter back to a ground prop at 12v led lights the fuse section then examine the lighting socket for voltage. Usually, van makers will manage a hotline (with Ground) to wall switches for lamps and for these lights without a wall switch, the connection is likely to be right to the light installation. The lighting in back of the coach's rest weren't checked and I was astonished to locate they no longer worked both.
Another thing I've learned about tomatoes, is that a tough light (my common flooding bulb) can overwhelm these poor little men. There are electric products that are very simple as you are able to plug into the wall, and an LED lamps to point that there's electricity. He changed to DC for power, exchanged the lights and quickly unplugged the ability supply as well as the lights did not hit.
I've unearthed that the line from the 15 amp breaker towards the lighting circuit is poor. If you have a residence-type light connected to a regular container (within your slide) your problem might be your GFCI. Also from everything you have said, your most probable cause of some lamps no longer working could be a bad terrain conection, so utilize your multimeter to check the voltage at the lighting sockets after eliminating the bulbs.