If your windshield wiper won't turn on the most common reason is a blown fuse. Come by 625 Auto Repair and we can replace the fuse quickly and affordably. Other reasons windshield wipers may fail are electrical faults in the control arm, or wiper motor. If your windshield wipers are failing to wipe away water the most likely cause is torn or worn-out wiper blades. Wiper blades are made of rubber and need to be replaced frequently.