I took some stuff apart, took some pictures and threatened to go to mud for answers. I reassembled everthing and my wonky rear wiper works just as it should. was it the threat? Or the dielectrci grease I added to a few electrcial connections....
I have no idea what wonky means, but perhaps thats what the screen around this little box I type in is doing today.
I took mine apart, and found my connections to be far less than clean inside the tailgate panel. It still worked, but is a little more consistant/faster now. Try that before you throw anything against a wall.
yup - had spotty ground in harness above headliner on Drivers side (USA - passenger side in Oz) - where the wires go througha rubber tubbe from the upper hatch to the main body of the vehicle. fixed wire and voila wiper worky!!
The good news is that I removed he headliner just in that side of the rear of the car which was pretty easy and the issue appeared to be that the connector itself just on the car side of where the wires come in from the hatch had very dirty connectors cusing high resistance.
I cleaned them up and sprayed them with some teflon spray to prevent corrossion and everything works again nicely - wiggle those wires like no tomorrow and everything is still fine..