The safety switch under the seat of my L3400 Kubota does not shut off the engine when tractor is in running and I raise the seat. Could there be anything wrong other than the switch itself? I hate to go and buy a new and probably expensive switch and find out that was not the problem. I tested the switch the only way I know how with an ohmeter. It has three poles and when I hold one ohmeter lead on the middle pole and the other on one of the side poles, ohm reading will come and go when lever is moved up and down. It will only do this with one of the outside poles and the middle pole.