The Turn Signal Light unit or flasher is load dependent, it needs a certain amount of current to function. Many bikes are designed to flash at a faster rate if a bulb is burned out. Since LEDs draw much less current, your flasher unit may act as if a bulb is out and flash at the faster rate. If you replace either the front or the rear turn signals with LEDs, you will typically need to add a load equalizer. If you replace both front and rear with LEDS, you will typically need 2 load equalizers. Many bikes have a 2 or 3 wire flasher that can be replaced with our non-load dependent flashers, these flashers are not self canceling but replaces the need for a load equalizer.