1. Faulty windhshield wiper motor: The wiper motor is responsible for driving the wiper blades. If the motor is faulty, it may stop working intermittently. To check if the motor is the issue, try turning on the wipers and see if the motor makes a clicking or grinding sound. If it does, the motor is likely faulty and needs to be replaced.
2. Bad wiper relay: The wiper relay is a small electrical switch responsible for controlling the wiper motor's power supply. If the relay is faulty, it may cause the motor to stop working intermittently. To check the relay, locate the relay box (usually under the hood) and swap the wiper relay with another relay. If the wipers work correctly with the new relay, replace the faulty relay.
3. Faulty wiring: The wiring connecting the wiper motor and relay to the vehicle's electrical system may be faulty, causing the wipers to stop and start. To check the wiring, inspect it for any damage, breaks, or corrosion. Repair or replace damaged wires as needed.
If you cannot identify and fix the issue yourself, take your vehicle to a qualified mechanic for diagnosis and repair.