I own a 2014 Alpine..
Coax connections as follows..
Two connections in water compartment ..
1. Left one is cable feed.. feeds LR and BR via two splitters..
.. one splitter is behind BR TV set OTA (rooftop over the air power button)
.. this splitter feeds both BR and LR TV sets from EITHER OTA antenna signal OR park RV cable connection in water compartment
2. Right connection is water compartment is dedicated coax feed to LR TV set outlet only for SAT antenna.. no feed to BR for this coax connection
.. behind TV set there is a double coax wall plate that would have a coax connected to both connections if not using SAT antenna
.. if using SAT then coax loop is re over and bottom coax feed goes to SAT receiver and then fed ti TV set via HDMI cable
.. there is no signal dedicated coax to the BR TV set and the OTA power button must be OFF to be able to watch cable TV on either TV set.
Note… there is also another splitter in the basement access door on passenger side located up high under a black cover and splits feed to basement for outside TV set
You can buy a very simple coax tester to trace the coax feeds easily such as this unit…
https://www.homedepot.com/p/Klein-To...E&gclsrc=aw.ds
The coax cable are ALL .. from factory RG6 but are not RG6 IP… (internet protocol)..
Also.. you WILL NOT find any wiring schematic for the TV coax runs for your Alpine nor will you find ANY electrical wire diagrams