Anyone who has changed all of their incandescent lights over to LED will tell you, a new electronic flasher will make your life a lot easier. One problem with incandescent lights is that they use a lot more electricity to run than LEDs do. So, your flasher is expecting a huge burst of energy to trigger the turn signal flash. But, when your LED light doesn't send that big burst and sends a small burst instead, the old flasher doesn't get the message and you don't get any blinking. Pop out your existing flasher and replace it with one of these - they're made specifically to work with LED turn signals! When a truck is converted to all LED lights, you may encounter problems with your turn signals. If your turn signals malfunction or fail after installing all LEDs on your truck, you will most likely need to convert your existing internal flasher to one that is made for LEDs.