The first thing you need to know is that none of the major RV manufacturers provide any wiring diagrams for RV owners. Their philosophy is that you should not be dealing with such things and you should have a certified technician troubleshoot electrical problems. Sorry, but this is the way things are in the RV world.
So, I can tell you that you should find a fuse box under your dash that provides power to the "non-drivetrain" electrical equipment such as your; dash fans, power mirrors, rear camera, and some other such equipment.
They typically use automotive-style fuses and make sure you do not change the value from the original used by the manufacturer.
In the past, I have had to draw a picture of the fuse box, and unplug the fuses one by one and make my own chart.