To clarify the wipers don't work well at all. Far left won't run the wipers unless you go to far right first to get them going, once they're going you can quickly change it to far left and they will work very slowly. Middle position stops everything but they will not park.

I'm guessing I must have a two speed switch? What are the positions on the three way switch? Far left off, one position right slow, next medium, far right fast?