Welcome to the forum. If you can locate the KeyTV panel, you can either remove the mounting screws and pull it out, or determine its location and possibly remove a panel to access the back side. If the coax connections are tight, then you will need to start testing the coax from the box. If there is a splitter, I’m not sure where it would be.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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