The receptacle with the 12VDC connector reminds me of my OTA CRANKUP BAT WING UHF antenna connections for my TV. When a small LED light is ON this tells me I can connect to this panel and be attached to the OTA BATWING roof mounted antenna to receive NATL BROADCAST Digital HDTV channels from the local towns. The small LED light has to be off if I want to use the CABLE TV connections from the local campgrounds.
My 12VDC Connection will provide around 8AMPs DC Current that would power up a 12VDC LED HDTV if you was using one.
Of course all RV's have different setups... My RV is a typical setup used for TT Trailers.
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Roy Ken