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7 Reasons a Bad Boy Zero Turn Won’t Turn Over or Crank

It’s frustrating when you go to start your mower and nothing happens. The engine won’t even turn over. When this happens, look for items that will keep the starter motor from getting the power it needs to spin the engine.

A Bad Boy zero-turn won’t turn over or crank due to a bad battery, loose or corroded wiring and electrical components, faulty ignition switch, bad safety switch, blown fuse, bad starter solenoid, or a bad starter motor.

Stay safe and follow the safety precautions outlined in your Bad Boy operator’s manual. Always remove the black battery cable from the battery before starting repairs on the electrical system.

Bad Boy zero turn won't turn over

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Follow all safety instructions provided in your equipment operator’s manual prior to diagnosing, repairing, or operating. Consult a professional if you don’t have the skills, or knowledge or are not in the condition to perform the repair safely.

Why Your Bad Boy Zero Turn Mower Won’t Turn Over

Dead or Bad Battery in Your Bad Boy Zero Turn

To extend the life of your Bad Boy zero-turn battery, it’s best to keep it fully charged. This is especially true during cold weather. A battery that is stored in cold weather can freeze when it isn’t fully charged.

A weak or dead battery won’t give the power needed to turn over an engine.

Test your battery using the steps in the article 5 Things That Are Draining the Life of Your Lawn Mower Battery.

Charging a Battery: Use a battery charger to charge your 12-volt battery. Before you continue, wear protective gear to protect your eyes and skin from electrical shock. Follow these steps to charge your lawn mower battery with a charger:

  • Access the battery and terminals. You may need to use a screwdriver to uncover the battery. Do not remove the battery from the casing.
  • Connect the charging cables beginning with the positive cable first. This is the red cable or the one with the plus sign. Place the cable on the positive battery terminal.
  • Attach the negative cable to the negative battery terminal. This is the black cable or the one with the negative sign.
  • Do not touch anything that doesn’t have a rubber coating to prevent electrocution.
  • Set the charger’s voltage and amperage level to the desired level. The average volt level for lawn mower batteries is usually 12 volts. More amperage charges the battery faster. Start with two camps and work up to no more than 10 amps. A slow charge is best.

If the battery fails to hold a charge it must be replaced with a new battery. You can purchase a new battery at your location lawn mower dealership, hardware store, or automotive store.

Bring your old battery with you. Most places will charge you a core fee unless you provide them with your old battery.

Loose or Wires and Connections in Your Bad Boy Zero Turn

With the constant vibration of the mower, the wires and components can vibrate loose and no longer make a good connection.

Check the wiring and components on your Bad Boy zero turn to make sure they are securely attached so there isn’t a break in continuity. Check over the electrical items for corrosion that can also affect continuity.

If you find corrosion on wiring, components, or terminals, first remove the battery cables and then the corroded components.

Try to remove this corrosion using a wire brush and a baking soda solution (2 cups water to 3 heaping tablespoons of baking soda). Replace the terminals if the corrosion is too severe to clean sufficiently.

Bad Fuse on Your Bad Boy Lawn Mower

A fuse is installed to protect your Bad Boy’s electrical system. Check your mower to make sure you don’t have a blown fuse.

If you’re unsure if the fuse is blown, you can check it by placing a multimeter probe on each prong of the fuse to measure resistance.

A resistance reading near 0 means your fuse is good. An infinity resistance reading indicates a bad fuse.

Replace a blown fuse of the same capacity as the fuse you are replacing. If you continue to blow fuses, you should bring your Bad Boy to your lawn mower dealership or lawn mower repair shop to troubleshoot the root cause.

Bad Ignition Switch on Your Bad Boy Lawn Mower

When the ignition key switch is bad, nothing happens when you insert the key and turn it. Your Bad Boy will fail to turn over and start.

Check the switch using a multimeter to check continuity to determine if the ignition switch is the problem. To do this, look for the prongs mark “B” for Battery and “S” for Starter Solenoid.

Insert the key and turn it to the start position. With the multimeter set to measure resistance, touch one probe to the B prong and the other probe to the S prong.

A good ignition key switch will measure resistance near 0 ohms. A bad ignition key switch will measure infinite resistance and will need to be replaced.

Bad Safety Switch on Your Bad Boy Lawn Mower

Your Bad Boy has an operator presence control system installed to keep you safe. A safety switch can be defective and cause your Bad Boy to fail to turn over.

Test your switch using a multimeter. You can also temporarily bypass the safety switch to identify a bad switch, but only do this for troubleshooting purposes.

Never operate a mower without the safety switchNever run a mower when a safety switch is bypassed. A safety switch can save you from serious injury and you never know when you’re going to need it.

Bad Starter Solenoid in Your Bad Boy Lawn Mower

A starter solenoid is an electromagnetic switch that, when engaged, initiates the starter motor to turn over your Bad Boy’s engine.

The starter solenoid can go bad when the spring becomes weak or the copper plate begins to corrode. A weak starter, bad battery, or bad ground can also cause the solenoid to fail.

Before you test your starter solenoid, you must have a fully charged battery. Continue testing the solenoid by using the steps to diagnose a bad starter solenoid in How to Tell Your Lawn Mower Solenoid is Bad.

Bad Starter Motor on Your Bad Boy Lawn Mower

Once you have ruled out the battery, cables, wiring, ground, and starter solenoid as being the reason your Bad Boy won’t turn over, it’s time to look at the starter. The starter can be removed and tested.

I recommend having your local repair shop that specializes in starter and alternator repairs test your starter and rebuild it if possible before just throwing a pricey new starter at your Bad Boy mower.

Still Experiencing Problems with Your Bad Boy Zero Turn Mower?

Own a lawn mower long enough, you’ll start running into problems with it starting, not continuing to run, smoking, leaking gas, giving a bad cut, vibrating, or another issue.

To help you save time and money, I have put together a guide to help you troubleshoot the next problem that develops on your Bad Boy mower.

You can find this guide at Common Bad Boy Lawn Mower Problems & Solutions.

If you are unsure how to perform diagnostics and repairs on your Bad Boy lawn mower safely, it’s best to have a professional complete the repairs.

This will help you avoid personal injury or additional damage to the mower. Your local Bad Boy lawn mower dealership or lawn mower repair shop will be able to help you solve your problem.