Not sure what you have checked and what kind of RV you have. If you have 12v going up to it, mine has a filter inline that I found under the Microwave by accident. Maybe it fried open? The best thing is to follow the wiring and look for where you lost the 12v. Good luck.
2016 Windjammer 3006WK
2010 Dodge Ram 2500, 4x4, Diesel, Front Hitch, Air Lift 5000 Rear Air Bags, (not really used, left over from our truck camper). Equalizer E4 1.4k/14k WD Hitch. TST 507 TPMS. Furrion FOS48TA Observation Camera. Garmin RV-760 GPS. Honda 2000i Genny.