Harley doesn't use a simple turn signal flasher relay. Instead they have a "Turn Signal Module" TSM, or "Turn Signal Security Module" TSSM. These are little microprocessors that include a bank angle sensor that shuts the engine off in a tip over or crash. The module talks to the ecm and instrument module on a CAN-Bus. Usually you can chose the TSSM with it's anti-theft features (can't start the engine without the fob that is encoded to your ecm and TSSM) as an option. With a TSSM the bike won't start unless that fob is very close to the bike.