On our 2004 Pace Arrow, I put a lighted rocker switch in the dash and wired them direct.
They also run when ever the AC is turned on based in the original wiring w/ the AC switch.
They do help cut down on the Engine fan running when in slow / hot driving conditions.
Mike in Colorado
2004 Fleetwood Pace Arrow 37c,(Jezebel) Ultra RV ECM / TCM, Bilstein's, Sailun's & Sumo's all round, pushed by a Chrysler T&C.