The rest of the 12v system works fine as does the other controls on the same panel (water heater, pump, slide outs, room lighting, etc.) it is just the aforementioned gauges. The levels gauges fail while everything else functions, except when engine is running. I find it even more strange that the ignition switch on auxiliary fails to light the gauges but ignition on and engine running lights up the panel. I have opened the panel, check all wiring for a possible short and found none. Fuses checked and all are good. Battery kill switch in powered position. I continue to search! Thanks for the suggestions.