If your wipers dont shut off I would think there is either a short, or the switch is faulty. I took my wiper switch apart on my 79 chevy beacuse it wasnt working. I cleaned it then reasembled it, now it works fine. Simplest thing to do is get another switch to see if that fixes the problem. If your good with taking things apart and reasembling them you could try cleaning the switch like I did. - Shane