ignition switch on Craftsman riding mower

Working on lawn tractor that the ignition switch will let the tractor start and run but you can't engage deck unless you switch it back up mode and push the button for backup then it will let you turn deck on and operate mower. Just noticed it will now discharge part of time. All help appreciated.
 
Is your machine built by MTD? There are Millions of these key switch units out there. I ordered a new one for mine and will be installing in a day or two. Key went bad. Here is the schematic for my Cub Cadet. Those switch diagrams let you trouble shoot the key assembly itself. You are going to need a digital meter. The whole box unsnaps from the dash. Just sit in the seat and hold it in your lap. In the first run position I bet you are missing that B-A1 connection or the L-A2. That L stands for lamps. One wire goes to the wire that supply's your headlights. What it does is tells the little idiot gizmo that your engine is running. Crazy. If you read the schematic you can check your tractor's harness too. Have fun, hope this helps.
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