How to Run Wires From the Horn to a Button Inside the Cab on a 2002 GMC Sierra
- 1). Run the wire from the horn along the outside of the engine bay towards the firewall on the driver's side.
- 2). Shine your flashlight up into the left side of the driver's foot well. Look for a round, black, rubber grommet installed in the firewall. The grommet may already have wires running through it.
- 3). Cut a hole in the center of the grommet with the utility knife. Push the wire from the engine bay through this hole and into the cab.
- 4). Pull the wire into the cab and run along the bottom of the dashboard to the button.
- 5). Secure the loose wires to the body of the truck with cable ties.
