How to Replace an Ignition Switch in a Riding Lawn Mower
The instructions in this repair guide show how to replace the ignition switch on most riding lawn mowers. The ignition switch is the most likely problem if the engine won't start when you turn the key or won't stop when you turn it off. To verify that the switch is the problem, use an ohm meter to confirm that there is no continuity between the S and B terminals. If the ignition switch is defective, replace it using a manufacturer-approved replacement part.
Less than 30 min.
Before you begin
Wear work gloves and safety glasses.
Warning: Undertaking repairs to power lawn-care equipment can be hazardous. Use the proper tools and safety equipment noted in the guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs should only be performed by a qualified technician.
Step 1: Disconnect the negative battery cable
Use the 7/16 wrench to loosen and remove the bolt securing the negative battery cable to the battery. Tuck the cable away from the battery so it doesn't touch the battery post.
Disconnect the negative battery cable.
Step 2: Remove the ignition switch
Lift the hood to access the back of the ignition switch.
Disconnect the wire harness attached to the back of the ignition switch; if it's difficult to unplug, wiggle the plug as you pull on it.
Use a small screwdriver to depress the locking tabs on the back of the switch. While depressing the locking tabs, push the switch out the front of the dash.
Tip: If you want to completely remove the hood, disconnect the headlights' wire harness.
Step 3: Insert the new ignition switch
Position the switch upright and insert it into the hole. It snaps into place when fully seated.
Insert the new ignition switch.
Step 4: Reconnect the wires
Fully seat the ignition switch harness onto the back of the switch.
Step 5: Reconnect the battery
Reconnect the negative battery cable on the battery and close the hood. Turn the key to test the new switch.