Many of today's off-road vehicles use super-efficient LED lighting with very low current draw. Standard non-LED relays will not work for these systems; even some 2-wire LED flasher relays will not flash properly. The Tusk Grounded LED Flasher Relay is a 3-wire system that includes a ground wire to adequately control flash interval on light systems with a low current draw or low trigger voltage, while still being able to handle the high current draw of incandescent lighting systems.*Black = Ground, Red = 12+ volt, Yellow = Signal.