Electrical issues in attitude toyhauler

Everything I disconnected I put back the way I found it. I wasn't having issues until the campground but I was never plugged into a gfi outlet. As far as my disconnecting wires I was trying to narrow down where the problem was. I don't know the make and model of the charger but it's in the breaker box. The box has "American " on the outside. As far as the transfer switch I can't find it. There is one box where the cord comes in then it goes to another box then it appears to go to the gen.