I have a 1994 520-h with a 20hp onan. The thing is in good shape and the electrical looks to be 99.9% original. The problem engine just cuts out. There is no sputtering or any pattern. If when it cuts out I turn key off then back on the motor will come back up. I've jiggled the key and the key harness while running to attempt to stall motor and this does not effect motor which leads me to believe that key is not the problem. I do not believe this is a short problem because after stalling the motor always starts back up. What do y'all think !??