Shut off the tractor by turning the rotary ignition switch counterclockwise on the dashboard and setting the throttle control lever to the locked position. Wait for the engine to cool.
Release the latches on each side of the hood cowling to raise the hood forward and off the engine.
Follow the path of the two wires from the back of the toggle switch on the rear of the dashboard to the two connection terminals on the engine coil. Pull the metal clip at the end of each wire off its terminal using needle nose pliers.
Clip each of the two ohmmeter probes to the two switch wires.
Flip the toggle switch to the "On" position. If the ohmmeter displays zero or swings to the infinity range, the switch is faulty and must be replaced.