Here are a couple of photos taken during the building of our '06 Dynasty. I'm actually not sure if they took the pics of a similar coach, or actually of ours, but it at least gives an idea of how cables were routed during the construction of these units. Even though yours is an '04, I would expect similarities in practices. The penetration outboard of the front left corner of the foam insulation panel is the entry to the compartment above the drivers seat where the satellite control panel is located on our coach, along with other devices.
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali