Mowing with brush hog behind tractor. Got off to move small tree in front of tractor. As soon as I let off clutch and got off seat, tractor shut off! The tractor has power but won’t turn over now. Can’t seem to find the safety switch that isn’t letting me start tractor. Switch under the seat doesn’t seem to be the issue and have clutch disengaged. Any ideas? Not sure where all safety switches are located, didn’t get any manual with tractor