Should be able to just turn it on. Now know that if the key is in the ignition , it will not power the TV. You will have to disconnect the relay on the switch.
Carl & Dawn
2015 Greyhawk 31FS
2015 Ford Transit Connect (our TOAD on a DEMCO Dolly)
DW, DSx2, DDx2 Catx2 Dog
Tampa Bay Area of FL