Trailmanor 2330 No electricity on rear

Hope someone can help.

I just bought a 1997 Trailmanor2330. My parents brought it home because I'm away in college. Everything in the trailer is working fine but the electricity at the rear of the trailer is not working, the only thing that works is the A/C, no lights anywhere. I've tried to contact the guy who sold it to me but haven't been able to reach him. This is my first trailer and I know nothing about it. Can someone more experienced help me figure this out, is there a switch somewhere I need to turn on, or any safety feature the railer might have. Would appreciate any feedback.

Thanks,

Andrew