I have replaced my factory tail lights with Led lights on my 2008 3500 GMC Sierra, now my turn signals blink at a rapid pace. I need a solution to this problem, I have been told that my flasher may be part of a circuit board that is not an individual part, does anybody know how to fix this problem?

 

Autozone has resistors you can add inline to the blinkers. Look in their bulb section and you will find the resistors.