Turn Signal Flasher For LED Lights 2-Pin. We occasionally have a question about slow or erratic flashers when changing over to the super fast LED lighting. Here is the solution. You absolutely must use this flasher if you have changed both tail and park lights to LED! This is a direct replacement for the common 2 pin flasher used since 1955. We even have the gender changer for those with reversed wiring. Just plug it in and hook up the ground wire.