Designed for H-D CAN-Bus models models that have two rear 3-1 taillight/brake/turn signals. These typically carry both turn and brake functions on the same factory wire making it impossible to wire additional amber or red light that functions as turn signal only on the rear of the motorcycle. This Custom Dynamics Turn Signal Decoder breaks out the left and right turn signal wires; with easy to connect Posi-Locks®; making it possible to add a rear amber or red light that functions as turn signal only without changing the stock function of the rear lighting. Compatible with additional add-on LED turn signals only.