To find it, you need to:
1. Consult your owner's manual: This is the best resource. It will have a diagram showing the fuse box layouts and identify the fuse for the horn.
2. Check both fuse boxes: Carefully inspect both the underhood and under-dash fuse blocks. Look for a diagram on the inside of the fuse box cover. These diagrams usually list the amperage and what each fuse controls. The horn fuse is usually a relatively low amperage fuse (likely 10-20 amps).
3. Look for a fuse labeled "Horn" or "Horns": This is the most straightforward way.
4. If you can't find it labeled directly: If you have a multimeter, you can test the fuses to see which one interrupts the circuit to the horn. Warning: Be extremely careful working with electricity.
Without your specific Silverado's trim level and owner's manual, I can't give you a more precise location.
