Welcome to the forum!
I'm not familiar with the Fleetwood camper, but if it's like mine the fuse panel and converter are under the "step" you use to get up into the cabover bed. My water tank is under the step also. There's a metal vented door that I can open to access the fuses.
Just a caution to not leave the camper plugged in all the time unless you have a smart charger in your converter. The typical cheap converter that gets put in campers will overcharge your batteries, greatly shortening their life.
For general use, you plug your camper in and that will charge your batteries and provide household current so you can run the microwave or AC and appliances you plug in (like a coffee maker).
I don't know if that answers your question or not. Feel free to ask more specific questions.