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I have an issue with my wipers on a 2004 Ford E350 6.0 diesel. When I turn the wipers on, they work in almost all intermittent positions, when i put them on constant on(slower setting) they stay on and will continue wiping regardless of wiper switch position. It only happens typically when it is raining, if I spray the windshield when not raining, only happens 40% of the time. I changed the wiper motor already, doesn't fix. I have been pulling the fuse to stop them in the meantime.