Always hard to figure these out over the internet. Here are some things to try.
- As CBWELL points out, there's a breaker panel somewhere. Find it, and confirm that the breakers are all on. Use a flashlight if necessary.
- It is possible that the city power outlet you are using isn't working, or is shut off at its breaker.
- It is possible than any adapters or extension cords you are using aren't working properly.
- There may be a wiring problem that the dealership missed.
To learn to see below the surface, you must adjust your altitude