On the 3 speed wipers the switch has a circuit breaker on the side.
Check your linkage as if it is upside down it will function but will bind up and cause issues. Easy to reinstall with the square block that bolts to the motor at the 6 o’clock when it should be at the 12 o’clock.
Don’t quote me on that. It could be the opposite of that. I sometimes forget to take pictures when I take something apart and it take longer than expected and forget how it goes weeks later.
