Ay ideas where to start? The main wiper switch and front wipers work fine, so I would assume I need to start at the rear gate. But where? I pulled the trim to access the relay and motor, but I'm not sure how to test the relay. Looks like the entire switch, motor, and relay are only sold as an assembly for close to $200. I checked wires and grounds and found nothing. I have a volt/ohm tester but am not sure where I should test. Thanks for any help!