Use the auxiliary lamp switch to turn on the auxiliary lamps as needed. When the high beam headlamp is turned on, the auxiliary lamps automatically turn off.
See Controls and Indicators → Accessory Switch → Nacelle Switches: FLHR. On FLHR/FLHRC models, the switch is located on the right side of the nacelle.
See Controls and Indicators → Accessory Switch → Switch Indicators. On all other models equipped with auxiliary lamps, the switch is located on the left side of the ignition/headlamp key switch on the fairing cap.