On vehicles with intermittent windshield wipers, the wiper motor circuit board may fail and cause the wipers to stop working at times. Replacing the circuit board should resolve the issue. 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 S10 Blazer Failed Wiper Motor Circuit Board May Cause Intermittent Wipers to Stop Working
Chevrolet S10 Blazer Problem
Model Year Affected: 1994
Visitor, 1994 Chevrolet S10 Blazer, 50,000 mi
GM had a recall on this problem. They replace wiper motor...problem is bad solder joint on motor circuit board at wiring plug connector. Five minute fix.