If your 110 volt outlets don't work, check the 110 volt breaker box to determine if breakers have tripped. You must be connected to shore power for the 110 volt outlets to work. You will have to "play" with things to see if they operate from the 12 volt
switch by the door. You must have battery power to determine what it operates. All the lights in the trailer run off of 12 volt
. You must check to see if your converter is working, that plugs into 110volt outlet and charges your batteries. If you have the old humming Univolt, I strongly suggest replacing with a new style 3 or 4 stage charger.