Kuryakyn 1647 Red Small Dual Silver Bullet Halogen Silver Bullets and Single Function L.E.D. Reflector Style Silver Bullets have a single power wire and ground through their mount Dual function L.E.D. Reflector Style Silver Bullets have 3 wires; run, flash and ground. They cannot be used for run-brake applications because they do not change intensity; they go from steady-on to on-off flash When installing halogen Silver Bullets as driving lights, the manufacturer recommends using wiring and relay kit (mfg/N2328) to avoid overloading the motorcycles running light circuit Assembled with high-stock, heavy-duty single filament 20 watt quartz halogen bulb Manufacturer recommends using them as auxiliary driving lights to help riders see and be seen