Unsure if your setup is anything like mine is on the 377, but I have three inputs: one labled SAT goes directly to the living room TV; one is a coax feed, which feeds all of the TV's (through the second coax connector located near each of the TVs), and the third (which I believe is labled AUX) feeds all the other TV's other than the living room. That connector you talk about with the three connections, if it has a switch on it, is the amplifier to the TV antenna on the roof. When switched on, it feeds over-the-air HD signals to all your TV's, when off, it switches over to coax/cable.
If you call Jayco and give them your VIN number, they will email you a print of what you need. Just ask them for the coax routing in the RV.
Hope this all helps!
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2016 Ram 3500 4X4 Dually, 6.7 Cummins, 3.73
2017 Jayco North Point 377RLBH, Cummins/Onan Gen
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