Daytona Twin Tec Model 1006 External Ignition For Harley This kit is designed to correct starting problems in motorcycles with high compression ratios or large displacement engines that use Twin Tec single-fire ignitions, Fully Programmable Ignition. The combined draw of the starter motor, single fire coil and long length of the wire between the battery, engine stop-run switch and the coil may leave too little energy at the coil to provide enough spark to fire the engine. Features: The Power Relay kit solves the problem by supplying full battery voltage to the coil Kit includes high-quality relay, wire and all required terminals