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You do need one.........and those are usually located up front over the window area in an overhead. That allows you to choose between satellite and park cable. You might want to give Fleetwood Customer Service a call or go to their website and get the information you don't have. (###) ###-####and give them your FIN number as that is how they are filed. Once you have that, get back to me if you need more here as all follow ups are included in our fee.
You need to have it on Park Cable if that is the source. That should be all you need.
They may have damaged the cable during construction. It wouldn't be the first time I have seen that happen. Get a new Coax cable and hook up the park cable dirctly to your box and see if everything works. IF so, you know what to look for. Is this an older model or a 2016 as your question shows both dates?
The control box that you turned the swtich off on.
Was that through the box or direct to a set? If through the box it might not be good. The dealer should have checked this out before delivery to you.
Just checking back in to see if you missed my earlier response to your question? If not, do you need additional input from me here or did you get this resolved?