I have a harmony 1011 riding tractor but when I go to turn the blades it turns on but the shuts of like a coupe seconds after any suggestions

Ht,
Either a seat switch or the electronic controller near the engine. The controller hates dampness. It is under a cover to the right and forward of the engine usually. I refuse to wash around the engine of this model since that unit gets wet and has to dry thoroughly to work again.
Peace,
Clarke