Sounds like a bad converter or blown fuse etc. charge your battery full up with the battery charger then connect your TT to shore power and disconnect the charger, if your friend has a volt meter check the battery level you should read above 13 volts at the battery while on shore power if not - bad converter or incomplete circuit.
Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.