1999 coachman 085sd

I just plugged the 110 cord from the tc into the generator plug. I was wanting to see if the A/C worked because when I purchased in March the temps were in the 30s and could not get it to do anything but blow air. Good news was the owner was right and the A/C works. I currently have the entire passenger side siding off and took a couple of the marker lights off in the process so that may be the issue. I am rebuilding all 4 rotted corners and the bottom of the cab over right now with hopes to be done before our trip in July. I pulled the fridge out so I still don't know if it works so hoping it works like the owners said also.

Forgot to mention that I don't have a battery installed yet either so I just made sure the wires were separated and not touched anything.