It can be the wiper switch or the switches inside the wiper motor. Headlights too, make sure the connector is firmly on the headlight switch too.
Thanks
I have an 84 F150 and changed the wiper switch and it still doesn't operate properly, there are some shit in the damned motor itself that control wiper modes too. Bad design.....
Mine lasted for so long, I have a feeling it was the bad winter weather. My poor truck is starting to rust bad: when I bought her she was in mint condition with 70k miles
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