I have a 91 S10 Blaser and one morning the wipers just didn't work. I replaced the wiper motor but the new one doen;t have the square black box in front of the motor (I think it might have been the pluse board) . But the new motor only works on one speed and the wiper motor runs all the time, and it doesn't go to the home when I shut it off it just stops. Can someone give me some help.