About a month and a half ago, I started having various issues with my windshield wipers. First, I thought the motor was dead, as the wipers didn’t work no matter what. After about two weeks of not working at all, the wipers would turn on if I reached a high rpm, even when the wipers were set to off. After a day or two of that, the wipers began to go randomly, varying in speed and sometimes only going about halfway. Now, the wipers go at a constant speed as long is the car is on. I believe the fuse is fine, and the pump for the wiper fluid still works fine.
Probably the switch.