Thanks, appreciate the help that always comes from you folks. Right now I had to take the trailer back into storage but will definitely take the battery out and have it checked. I admittedly don’t know much about RV electrical systems. I always though that when the RV was plugged into shore power that “overrode” the 12 volt system and lights were working on shore power. So, if the battery were disconnected or removed, there would be no overhead lighting even though connected to shore power? 2nd question: the RV had been hooked up to shore power for 3 or 4 days prior to this event...I believe I heard the converter working a time or two while in and out of the trailer...that should be charging the battery, right, unless the battery is failing and won’t “take” a charge. Right? 3rd question: when the lights faded and then came back on, was it because the battery was “taking” somewhat of a charge but not holding it? 4th and last question: if I hadn’t had to take the RV out of the driveway and back into storage and had left the lights on, the battery would have almost completely lost its charge and the lights and everything else 12 volt would have failed/faded, right (of course I realize that that would happen also with a “good” battery, but not as fast. Actually the week before I brought the trailer home I had done some interior work while trailer was inside the storage building and I was pleasantly surprised at how well things worked on 12 volt power while I did the work...I was sort of expecting to run out of battery power over there but didn’t.
