2. Find the fuse box located in the engine bay.
3. Open the fuse box.
4. Locate the flasher relay. It is usually a small, black box with a green or blue cap.
5. Remove the flasher relay by gently prying it out with a flat-head screwdriver.
6. Replace the flasher relay.
7. Close the fuse box.
8. Close the hood of your Nissan truck.