I just bought a newer motor home and again the tv isn't hooked up. There is twelve cables in upper cabinet and none marked. Roof satellite . Distributor box for front ,back And out side tv's. Extern...
I would try and figure it out myself. If you have a portable radio around, or something with an earphone plug (iPod, Smartphone, Laptop, etc), make a cable that you plug into the audio device and the cable outlets in the cabinet. Grab a speaker and modify it so you can plug it into the cable. Just walk around and plug in, when you hear the sound you can mark which one it is. If you go up on the roof you should be able to disconnect the antenna satellite coax to run the test.