I have a 1992 F250 4x4 and the wipers are REALLY slow. Even on the fastest setting they seem like they are on low. All the speeds work and the intermittent speeds work too, but it takes at least 3 seconds for them to make one swipe. I did a search and saw something about cleaning the switch on the turn signal, but didn't know if the motor was bad? It is also making the clicking noise under the passenger's side dash board. Thanks for any help!