i have a '92 lude and my wipers only work on the low and high setting. delayed doesnt work and where ever i shut it off thats where the wipers stop, so i have to time shutting them off when the wipers reach the bottom. i replaced the whole wiper switch, didnt fix the problem so i got a new wiper motor and still didnt fix the problem. what is making it do this and how do i fix it???