My last trailer had 3 coax inlets to 4 TV's. I think the one marked cable connected with the antenna to feed all the TV's. Satellite 1 & 2 both had splitters just behind the exterior faceplate, with 1 to the bedroom & basement and 2 to the main & garage. You could check the connections behind both the interior & exterior faceplates, maybe a loose coax cable?
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Mike & Helen
2014 Voltage 3895 EPIC III
2013 Ford F350 CC DRW FX4
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