Welcome to the forum, and congratulations on your Bounder... Is it a Diesel or Gas?? What chassis? If your Bounder is a gasser, and a Ford F53,, your Bounder and my Southwind will be very similar.
If you are plugged into shore power, all your 110 volt outlets should have power, and all your lights should work..
The lights are all 12 volts, however, when you are plugged into shore power, there is a power supply called an "Converter" that converts 110 volts to 12 volts, and this should supply all the 12 volt devices. If your lights aren't working, but you have 110 volts, then you need to see why the converter isn't supplying 12 volts.
Battery Disconnect switches.. You should have 2 switches that are used to connect/disconnect the 12 volt batteries. These are generally used when storing the unit. The switches are located somewhere near the entry door, Mine are located in the small cabinet directly above the door.
SLIDES - The slides work on 12 volts and should work OK. However, they draw a LOT of current so I usually run my slides while the engine is running.
You frig (if its and absorption type) should work on both propane or 110 volts. It should automatically switch to 110 volts when your plugged into shore power, and switch back to propane when you unplug from shore power.
I have a lot of information on my web site, including DOWNLOADS of manuals for most of the systems. Including a SOUTHWIND
1999 Southwind 35S – Southwind by Fleetwood – sporting its new paint job