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Hi my name is Robert...
Do you have a volt meter? IF you are hitting the emergency start and the lights are coming on you might have low battery voltage as that is connecting the batteries together. I would go to the house batteries and get a reading, if you have good voltage at the batteries and have a disconnect switch inside to isolate the battery power follow the cable from the battery and look for a solenoid, on the solenoid will be two LARGE posts, one should come right from the house battery and have the same voltage as the battery, check across the solenoid, if you have NO voltage then jump the posts and see if your power comes on, if so bad solenoid. Also want to mention the adapter going into 110, you need to be very careful when you step down like that, as you turn items ON you can have line loss as you are trying to pull to many amps through a small cord.
DO you have a generator on this and if so and you start the generator do you get the power back? IF so it could be low battery voltage as the power converter should charge the battery when you have AC power available. SO the key is if you have good voltage at the batteries, if the voltage is low it is a charging issue or you have a draw, if the voltage is good possibly a bad solenoid not allowing the DC power into the RV... Hope this gives you some direction, let me know if you need more help, follow ups are included.... Robert