I know there is another good thread going on about a related issue but didn't want to side-track it so making a new post. My wiper and pump unit are relatively new, and the car has been re-wired some time ago. When I turn on the wiper with the knob, I here a definite "click" inside the wiper unit, but no motion. Any guess what this could be? I'm told the wipers worked in the past. Thanks!