This video shows how to replace the ignition switch on most riding lawn mowers. The ignition switch could be the problem if the engine won’t start when you turn the key or won’t stop when you turn it off. To determine whether the switch is the problem, use a multimeter to test whether electricity can travel between the S and B terminals. If the ignition switch is defective, install a new one that fits your model.
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Turn the ignition switch off and remove the key. Lift the seat. Remove the bolt connecting the negative cable to the battery and tuck the battery cable away so it doesn’t touch the battery post. Lift the hood to access the back of the ignition switch. Release the locking tabs and push the switch out through the front of the dash. Disconnect the wire harness attached to the back of the ignition switch. Connect the wire harness to the back of the new ignition switch. Push the ignition switch into the dash and engage the locking tabs. Lower the hood. Reconnect the negative cable to the negative battery terminal. Lower the seat.