Those might be 110V AC lights. In our coach, an '06 Dynasty, there is a wall mounted light on the driver side slide, and it is 110V powered. So you might check your AC breaker panel. Or, if you are not connected to shore power, check to see if your inverter is on. If all three look similar, that would be a good possibility.
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali