It might help if you posted what RV you have.
In my 10 year old 28A MH there is a circuit breaker near the battery disconnect solenoid and converter, under the bed. It failed a few years ago and I replaced it.
Other RVs may be entirely different.
It may be better just to follow the wire from the converter to the battery and see where the power ends. A test light or a voltmeter would be a big help.
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