I thought the boosters were just for the OTA antenna, not the cable?
Are you trying to connect to a campground cable? If so, that should be controlled by the distribution box (BOMB--Box Of Many Buttons) and have several buttons, one labeled Cable??? Hook up the cable, push the power button, select Cable and hope for the best.
If nothing else works, get enough cable to hook up directly from the pedestal thru the door and see if it works.
Being a used unit, no telling what a previous owner did to get it like he wanted.
Can you check that the cable you are using is the same one that is coming into the trailer?
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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