The auxiliary/fog lamps provide extra light to the road and surrounding environment in dark or rainy conditions. The lamps also give the motorcycle more visibility to other motorists.
Domestic/Canada configurations: The auxiliary/fog lamps are configured to turn off when the high beam headlamp is turned on, except as required by state/province.
Auxiliary/fog lamps can be configured to remain on or turn off with high beam operation based on legal requirements for each location. See your Harley-Davidson dealer.