To find it, you'll likely need to:
1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location of fuses and relays.
2. Look in the fuse box under the hood: While less likely to be here than under the dash, some vehicles place it here.
3. Look in the fuse panel under the dashboard: This is the most common location. You might need to remove a panel or cover to access it.
4. Use a flashlight and carefully examine the area. The flasher relay is usually a small, square or rectangular component.
Note: Some 2007 Silverados may use a Body Control Module (BCM) that controls the turn signals instead of a separate flasher relay. If you can't locate a traditional flasher relay, it's possible your truck uses this system. In this case, replacing the flasher requires a different approach, likely involving a dealer or specialized mechanic.