Asuming it's a GM intermitant wiper set up.......Hehe they do it. Our 79 Blazer does it when you pop the parking brake, slam the door, hit a pot hole. Some times it will go a week and not do it and sometimes it will do it 10 times in one day. It's usualy a problem with the Intermitant wiper control modual that should be under the dash very close to the colum. They did not have very long harness on them.
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1959 22' Caravanner
1988 R20 454 Suburban.
Atlanta, GA
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