Hello, I have a 85 Ford F150 and the wipers do not work well. I have replaced the motor and the switch. When i turn the **** it only moves 1/2 inch and then stops and then goes again. Right now I have no idea what to do next.

 

You should maybe have a wiper control module. On 90's trucks it's behind the glove box (you can hear it click). Not sure where yours is - or if you have one.