Need Help with Windshield Wipers ASAP

The multifuntion switch (dimmer, wiper, turn signals) are different for different years. 87-98 will work in any 87-89 car. The 90-93 switches only work in 90-93 cars. You can't put an early model switch in a late model car, nor can you put a late model switch in an early car.
 
I've had the same problem for some time now, and its not the multi-function switch, I know I used the right one. There has to be something else that controls the wipers between the switch and the motor. Does anybody have any ideas what it is and where it might be?
 
I have the same problem..really annoying :bang: Even on high mine sometimes won't work & then all of a sudden they'll work again..

edit: I just read the old post..I'll definitely check that out..maybe I loosened the wiper governer when I tightened my steering column last time..