Furnace,water heater and refrigerator not working. Trailer has 120 volt with all outlets working. 12 volt lights working. Stove top burners light. All 12 volt fusss verified with volt meter. No lights...
Does the trailer have a battery disconnect switch?
It looks to me that the battery is not in line. Reason the indicator levels on panel do not function along with 12v appliances. A incorrectly wired converter might leak some current to light some 12v lights.
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