Custom Dynamics Turn Signal Decoder Module For Harley This handy Decoder Module from Custom Dynamics allows you to add additional turn signals to your bike with out affecting the operation of your stock lamps. Features: Separates rear turn signal function from brake / running light circuit Easy to connect Posi-Locks, makes it possible to add a rear amber or red light that functions as a turn signal only without changing the stock function of the rear lighting Compatible with additional add-on LED turn signals only Only one unit needed per bike