Abstract: In a crop harvesting and threshing machine having an internal combustion engine operatively connected via an electrical circuit to a starter motor, a grain storage tank, an unloading auger movably mounted to an in material flow communication with the storage tank, a hydraulic cylinder operatively connected to the unloading auger to effect the movement of the unloading auger between a first inboard storage position and a second outboard unloading position, a control mechanism connected to the unloading auger between the first inboard position and the second outboard position and movable between first, second and third predetermined positions, the first predetermined position corresponding to the first inboard position and the second predetermined position corresponding to the second outboard position, there is provided a safety switch operatively connected to the electrical circuit and the hydraulic cylinder such that the control mechanism must be in the third predetermined position to permit the flow of elect