ceiling lights

I just bought an '85 Funlite - and I have a few electrical woes. There are no cabin lights and I can find no plug in for the trailer. Where is the factory plug in supposed to be? I found converter(?) under the front driver side cabin seat that I would've thought would need to be plugged in to...

Our ceiling light switch only turns on one light right by the door. Did anyone rewire the lights to have more come on when you hit the switch?