I use them as tail lights, brake lights and turn signals (if I use two) on my bikes. I use a trailer wiring converter so turning and stopping work together. On some motorcycles I only use the rear and brake light function. I didn't have to make any special adjustments to get the LED to work with my electrical system. Installation is very easy with the screw that comes with the headlights. My only issue is that two different sets of lights make them appear differently bright.
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