The brake light flasher connects to the center brake light on the K1200LT trunk rack. It makes the brake light flash rapidly for about two seconds, and then stay on solid for as long as the brake is applied. The cycle repeats every time the brake is applied. Kit comes with the necessary connectors as pictured. You can download the installation instruction by copying and inserting the following URL into a new browser window: http://www.riderwest.com/Documents/K1200LTBrakeFlasher.pdf