This is a diagram I made of mine as it came from the factory. If you don't have a dish installed the coax is there but is underneath a decal on the roof that shows where to cut a section out to access it and install a dish.
It's hard to read but the second splitter is behind my microwave and one output goes to the outside entertainment center and the other to the rear TV.
The coax on the right side of the plate comes from the service bay connector and had a red band on it.
The Winegard wall plate (they call it a power supply) acts as A/B switch. When the button is pushed and the LED lights up the rooftop TV (batwing) is switched to the first splitter and the amplifier in the batwing head is turned on.
If you are using an RV park TV cable connected in the service bay, the switch needs to off.
