I have a craftsman riding lawn mower model 917.270810. When I turn the key nothing happens, there is no spark and it does not roll over. I have replaced the starter, the key switch, the senser undernieth the seat, the starter relay, both the 30 amp fuse and battery are fine. What else can I look for?
I'm sorry to hear that you are having some difficulties with your Mower not starting. I did some research for you at Managemylife.com and found an expert answer to a similar question that may help until your expert can respond to your specific question. The link is attached below. If you do decide to schedule service and have a qualified technician help you, I have also attached a link to Searshomeservices.com. I hope these links provided assist you.
I have attached a diagram to help you determine the problem with your tractor. Lock down the parking brake and make sure the blades are off. Then turn the key to the "start" position and check for power everywhere a green arrow points to. You should have close to whatever voltage is on the battery at each of those points.
Let me know what you find and we can proceed from there.