Where is the back-up light switch on 1990 Ford Mustang?

On a 1990 Ford Mustang, the back-up light switch is typically located on the transmission. It is mounted on the side of the transmission case and is activated when the gear shift is in the reverse position. To access it, you may need to raise the vehicle and remove any necessary components for better visibility. If you're troubleshooting, check the wiring and connectors for any signs of damage.