The make and model is an Elixir Industries ELX-45 - I found the owners manual and verified it is the one in the coach.
What is ATS? Sorry if that is a silly question. I am not sure what I am looking into.
If I remember correctly, the shore cord is wired in. You are referring to the external rear of the coach, correct? I can verify that as well.
Please let me know what information I need to provide you. Thanks for the patience.
I inspected everything again and it all looks to be wired correctly. I took the converter board back out. I examined the old housing and the new one. There is a difference. The two Yellow wires I mentioned earlier are directly wired to the fuse board in the old housing. In the new one, I discovered a secondary board in the corner roughly 2 inch squared. The yellow wires (from the fans below) along with the negative white are soldered to it. There is a coiled copper tube as well. Then two more short pairs of wires come from it to the fuse board. If this needs to be there to support the newer board then I need to replace the entire unit. Does that make sense and sound like the issue? If so, so much for the easy path.
The white is not connected the the breaker at all. It is coming from the ground. See the attached link to some pictures. I included the battery just because I had it.
I have happy to report that the problem is resolved. Since I had the time and purchased the entire unit, I decided to replace the entire panel. I took the old one out and installed the replacement converter. Once it was all back together, I plugged in the RV to external power, left the batteries disconnected and I immediately had house lights and power through the entire RV. I reconnected the batteries without any issues. Everything is functioning on batteries only as well as on power. I also noticed that the fans on the converter were operational and this was not the case on the old one.
Thank you for all the assistance.