I know this subject has been covered before as I've searched the archives. However, I've still got some questions.
This van belongs to my father-in-law so I don't really know all the history except that the rear wiper wouldn't shut off. Actually the wiper arm was not moving but the motor was making a noise as if not engaging the gearbox properly. This would happen even with the switch off. So he disconnected the harness at the motor.
This is where I come in as he asked to me to take a look at it. I plugged the harness connector back together and hear the noise from the motor/gearbox; wiper blade does not move. As stated earlier, this occurs with the key on but the wiper switch off. So I've taken the blade off (yeah, that was fun) then removed the motor. Upon bench testing the motor, I can hear it running with 12 volts applied but the shaft doesn't turn. Obviously a new motor is needed. That I can do. But here's my question:
Why did the old motor try to run even with switch off? There are two wires in the harness that connects to the motor, a brown with pink stripe wire and a brown with green stripe wire. The brown/pink wire has voltage with the key on and wiper switch off. The brown/green wire gets voltage with key on and switch on but only every eight seconds or so. I think this is correct. Will replacing the motor correct all the problems or could there still be a problem between the switch and motor? Thanks for any help.