Lawn tractor locked up

It's a farm implement. Have you tried hitting it with a hammer?
 
You should be able to do some quick voltage measurements. When the key is turned to "on" do you have +12v at the coil for the engine, or whatever the ignition is? In "start" do you have +12v going to the solenoid. You can jump the solenoid to see if the engine cranks over. With ignition on, that should start it.

Also, check all electrical connections, especially grounds. Electricity needs good conduction to work right.
 
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