I retired in 2009. The only thing I can think of, is there a wire that is connected to the lights that dims the display at night. Maybe they ran the wire from an ignition source and it dims the display when the switch is turned on rather than when the lights are turned on. Turn on the key and don't start the engine and see if the display dims.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.