The windshield wipers may not work intermittently due to a faulty wiper motor control board. Our technicians tell us that lightly taping on the wiper motor when the fault occurs should temporarily get the wipers working again. Some vehicles were recalled for this problem and some were not. You will need to check with your local dealer to find out if a specific vehicle was included.Google+
Car Problem Reports
Chevrolet 3500 Pickup Windshield Wipers May Fail Due to Faulty Wiper Motor Control Board
Chevrolet 3500 Pickup Problem
Visitor, 1990 Chevrolet 3500 Pickup, 175,000 mi
windshield wipers move erratically sometimes stopping strait up blocking my view of the road when driving.