Newbie needs help with Interior Lights

[ADKCamper]

Hello,
I just purchased a used 2005 Forest River/Flagstaff 176ST LTD popup camper. The previous owner did not have an owners manual.
The interior lights do not work, nor does anything else on the interior (frig, furnace).
Then camper had a bad battery when I purchased it. I went out today and purchased/installed a brand new deep cycle battery.
Still no interior lights....I have no idea how to get the refrigerator to start, nor could I get the furnace to kick on after following the instructions (turning on the gas and hitting the red ignitor button.
I'm heading out in the morning for a nice 3 day weekend....big bummer not to have anything working.
Does anyone have any advise?
Thank you,
Mike T.

[garbonz]

Best guess is corroded fuses. Trace your battery wiring and you will see little boxes with 2 terminals in the circuit. If you have a multimeter that would be good.

[BigBaron]

Fuse right behind the battery box, under the front of the trailer near the tongue, or inside the converter. Check those first.
Second, does it have a galley switch? That switch only allow interior power when the sink is "flipped" over.

You're supposed to check these things earlier than the night before...
Not that I've ever done anything like this.
Nope, never happened...