I have a 1991 F 250 XLT with intermittent wipers Wipers work on high no low or intermittent speeds washers spray but in low speed wipers will stop in windshield and will only park if you go to high position then to off.
'91 has the wiper control below the instrument panel. Same trouble. there is an independent module under the dash behind the light switch mount that likely is at fault. Have yet to place it high up on the priority list. Let me know how you make out, please.
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