On Harley Touring models where the turn and brake functions share the same factory wire, adding a rear amber or red turn signal-only light is typically not possible. Our Turn Signal Decoder solves this by separating the left and right turn signal wires, using easy-to-install Posi-Locks. This allows you to add dedicated amber or red rear turn signals without altering the factory rear lighting functions. Designed for use with additional LED turn signal add-ons only.