If you have a dash pad, you would need to remove that first to access the motor cover or you can just fold the windshield forward. The motor rotates at 360* when its powered up. What limits the travel of the wiper blades is the arm from the motor to the linkage. What you might want to do first is make sure when the wiper is turned off, mark the location of the wiper arm shaft at its parked location. Actuate the motor and mark the full sweep location. From there, you can determine if its a linkage issue or a wiper arm issue. There are 2 types of wiper arms that came on the CJ, one with a ridgid non adjustable arm and the other has an adjustable arm angle. This might a difference on its proper function.
