The flashers, also called blinkers or turn signals, as well as the hazard lights on the Ford F-150 pickup truck are all controlled by one simple relay module. If you have a front or rear flasher that isn’t working, chances are you need to replace a simple five-pin relay module located on your steering column. The part costs very little, and replacing it will take just a few minutes of your time.
Step 1: Use a flat-head screwdriver to gently pry the clam-shell door open. The door is located under the instrument panel on the top of the steering column between the instrument panel and the steering wheel.
Step 2: Remove the door and set it in a safe place.