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Hi i just recently purchased a 99 F250 PSD, Ext cab 8' bed.
It has 180k on it. The girl i bought it from said the wipers were staying on non stop so she pulled the wiper relay. She then brought it to a dealer who then told her it needed a new GEM module. OK so i just replaced the GEM module and the same **** happens. No wipers but the washer fluid pump comes on when you turn the switch for the wipers. Need to know what other modules or switches control the wipers. THANKS