My dad bought this for his 06 900 Vulcan and after 6+ hours figured out somethings about this. Found out hooking all 4 wires up is to much for the turn signals. To save your self time and energy hook one wire up to the front turn signals (left or right) and only one wire to the rear on the OPPOSITE!!! side. This unit is over kill for what is needed. You may have different results for your bike but thought i would share what we found out to save you on your install.