Wipers Won't Turn Off

[Manche757]

Here is an odd one. Now and then the wipers will not turn off unless I turn off the engine. It might happen a time or two. Then it will be a while before it happens again. I had the turn signal/wiper switch replaced about a year ago. Maybe a defective relay? 89,4.0

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[AZJeff]

More likely is the “park” switch in the wiper motor transmission is stuck in the “permanently on” position.

 

you might be able to fix it by removing/disassembling the wiper motor to clean/repair the park switch, or replace the whole wiper motor/trans assembly.