I reckon commonly found state law should be pointed out here, Florida’s as one example:
“Title XXIII
MOTOR VEHICLES Chapter 316
STATE UNIFORM TRAFFIC CONTROL
316.303 Television receivers.--
(1) No motor vehicle operated on the highways of this state shall be equipped with television-type receiving equipment so located that the viewer or screen is visible from the driver's seat.
(2) This section does not prohibit the use of television-type receiving equipment used exclusively for safety or law enforcement purposes, provided such use is approved by the department.
(3) This section does not prohibit the use of an electronic display used in conjunction with a vehicle navigation system.
(4) A violation of this section is a noncriminal traffic infraction, punishable as a nonmoving violation as provided in chapter 318. “
For the sake of legal and insurance responsibility, including at resale whether you ever used the TV while driving or not (the next owner might), I’d just ferret out and repair the faulty lockout switch. Ours appears to be in one of the junction/outlet boxes behind the fridge; my assumption is that a 12v switch in there from the ignition shuts down the circuit running up the drivers side to the cap overhead, affecting any device on any outlet along the way.
Joel