Monty,
Now to start isolating. Is it all the 12 VDC lights at the same time. Suggest you actually turn them all on and let them run for a while. As long as you are 120 VAC and the converter is working you will have 12 VDC. If it is a selected few then start pulling fuses one at a time and document which lights are on which fuse. That is a smart thing for all of us to do "especially me". If it is only one string off one fuse then I suggest pulling the fuse panel and tighten all screws. (OH - Safety - Do this with the negative led to the battery disconnected and the 120 VDC turned off.)
Good luck and let us know what you find.
Cheers,
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