The ninth page of the 2004 schematics in the library mentioned above shows the entertainment system coax wiring diagram for the 2004 coach, like my coach. That schematic at least shows the color code for the various coax lines from the satellite dish, the cable entry, the over the air antenna, etc. That color code seems to be consistent from year to year. Other than that, someone who knows good entertainment center wiring can figure it out. Some better than others. RV entertainment systems are more complicated than home systems due to more signal choices, so some home theater guys might be in over their heads.
Even with the year, WRV frequently made changes to equipment mid-year. I have seen a few '04's that were identical to mine, and some that were quite different, depending on if early-year or later-year.
If you are not the original owner, chances are the previous owner has done something with his wiring. Sometime good, sometimes bad! Mine is completely different now for example. Everything but the TV has changed, and that will change this week!
'04 Alpine Coach 36' MDDS