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Check your battry voltage with it plugged in should be about 13.3 plugged in and that means it's charging. Unplug rig and if it's below 10.5 nothing 12v will work , get a new battery
Your question and facts are a bit terse. Usually when shore power is present you can leave both house and chassis batteries connected so they are charged/maintained by your charger/converter. Using a multimeter, test all parts of the 12v circuits to be sure the converter/charger is outputting at least 13v to house and chassis batteries.
Your trailer has two electrical systems, 12v and 120v. The 12v system has a battery and perhaps a converter/charger to power it. The 120v system must he hooked up to 'shore power.' Both systems have their own protection. The 12v system has a fuse panel, check for power at each fuse. 12v wall switches are often smaller and don't look like typical 120v switches like in a house.
The 120v system has a breaker box and circuit breakers. Reset each breaker by turning off then on again. In addition, the 120v outlets might have a GCFI outlet near a sink. It often is wired first in a breaker circuit, thus giving GCFI protection to other outlets in the circuit. Test the GCFI and make sure it clicks off and can be reset.
Do you have 12v when plugged in or on generator? If you do, then it's likely 1) a fuse or breaker for the converter, or 2) the converter is dead. Is your battery good? Try using taking the battery out and using to crank your car or truck. If that works, look at the fuse or breaker for your converter or your converter may be dead. If the batter doesn't work, do the opposite and put your car/truck battery in your RV and see if your 12v works -- if it doesn't, then check your converter fuse/breaker or it may be dead; if it does, then your battery is terminally (pun) dead.
Look for breaker panel, usually a brown cover/door. Under fridge, on end of bench seat, or under, even the washroom on wall is used now. If all else fails, turn on all lights (12V) and listen for a small fan to come on. That's the converter cooling fan that usually comes on when you add load.
You are probably hearing the cooling fan cycling. The fan is controlled by the temperature which is controlled by the amp draw which produces heat. If you are using your refrigerator, water heater, AC and lights then you are drawing a heavy load on the converter. I know that the water heater, AC and refrigerator may use 100 electricity but they also require 12v power to run the circuit boards.
The converter is incorporated with the fuse/breaker box. Remove the cover of the breaker box and the converter should be in the lower portion. You will have a small gauge black, white and green wire that will be routed into the breaker (110vac) side and two heavy gauge wires; red and white, that will be routed into the fuse panel (12vdc) side. Once disconnected there should be one or two small screws holding the converter in place. Remove them and slide the converter out.
You might unhook the battery and with the camper plugged in to shore power the 12v lights should work. If not check the breaker that goes to the inverter. If that is not tripped then check the power output at the converter. I would expect the inverter is shot. I replaced the one on my Jaco two years ago with (Progressive Dynamics 60 Amp Power Converter with Charge Wizard and the remote pendant)
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