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Last updated October 28, 2026 · Applies to: riding mowers from Toro, Husqvarna, Troy-Bilt, John Deere, Craftsman and Briggs & Stratton and others
Cause 1: Dead or weak battery
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 2: Corroded or loose battery cables
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 3: Seat, brake or PTO safety switch
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 4: Failed starter solenoid
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 5: Worn ignition switch
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 6: Blown fuse
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Cause 7: Bad starter motor
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Which cause is it?
The decision table is being compiled from shop pricing and manufacturer data.
Brand notes
Brand-specific notes for Toro, Husqvarna, Troy-Bilt and John Deere are being researched.
When to take it to a shop
Hand it over if the engine still will not run after the fuel, spark and air checks, if you find metal in the oil or the
engine is seized, or if the machine is under warranty (opening it yourself can void it).
Find a riding mower repair shop near you
Use your location to jump to the nearest city we cover, or pick your state.
Answers being written: Why does my riding mower do nothing when I turn the key? · How do I test a riding mower solenoid? · Can a bad seat switch stop the mower from cranking? · How much does a shop charge to fix a no-crank?