* A bad wiper motor. The wiper motor is responsible for powering the windshield wipers. If the motor is bad, it will need to be replaced.
* A bad wiring connection. The wiring connection between the wiper motor and the power supply may be loose or corroded. Check the connection and make sure it is secure.
* A bad switch. The switch that turns the windshield wipers on and off may be bad. If the switch is bad, it will need to be replaced.