Thanks all for your comments and suggestions.
We did find out that it is the converter that is going.
We checked all the grounds, the battery, connections on the frame.
We spoke to our neighbor at our campground who had just purchased a new camper. They were having some issues with items not related to the converter and in the process they found that the battery was not connected. Their lights were working fine. The converter was running constantly supplying them with lights. We unhooked our battery to see if the converter would cut in. It did. However, in a few moments it cut out and the lights went out. It did this a couple of times. We hooked the battery back up and the lights came on. We tried this a couple of times and same thing happened each time. So we can only conclude that the converter was not functioning properly. The converter should supply lights whether you have a battery hooked up or not.
So, short story - we need a new converter. Due to the lateness in our camping season, we will replace it in the spring.
Hope our findings can help anyone else who may have this issue at some point.
Happy Camping everyone....