HD Turn Signal Flasher For LED Lights & Trailer Towing 2-Pin. We occasionally have a question about fast or erratic flashers when changing over to the super fast LED lighting or trailer towing. Here is the solution. This is a direct replacement for the common 2 pin flasher used since 1955. Lasts 10 times longer than a regular flasher. Also, you can hear this one click! The part number or package may vary but the product is the same.