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John Deer F725 won't start - one of the safety switches is prohibiting starting. Battery OK , even tried jump start ...but won't turn over.

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Hello,
My name is Dane and I am going to assist you in solving your problem. However, I would ask that you do one check for me before we go to the seat switch procedure. Please find the starter solenoid on your mower. Make sure that the large cables coming from the battery and going to the starter are clean and tight. Make sure that your 1 (possibly 2) wires going from your switch to your solenoid are also clean and secure. Use a volt meter on DC volts, or a test light and check the small lead on the solenoid and make sure that when the parking brake is on and the Deck PTO is off, that you aren't getting 12VDC when the key switch is turned to the start position. If you have a 2-wire system, 1 of them is for ground only. 1 of the 2 wires should get 12VDC. If you get 12VDC at the small terminal of the solenoid, but no power to your starter, the solenoid is bad.

But you are probably correct that you have a problem with the seat safety switch on your lawn mower. The seat safety switch makes sure that if you are ever thrown from your mower, the engine will die.

You should check under the seat of your mower and locate a small square box with normally 2 wires connected to the end of it. While looking at the switch, press down on the back of your seat and make sure your seat is activating the switch. If not, you must get the switch correctly positioned so it makes contact and pushes the button. If you found nothing wrong there, go to the next step.

Make sure the 2 wires are connected and the wiring is in good shape. Disconnect the wires from the switch and make sure there isn't any corrosion on the terminals of the switch or the connector. After you have done this, reconnect the switch and try again to see if the mower will start.

If not, disconnect the switch again and place a jumper wire between the 2 prongs of the connector and tape them so they will not ground out on the frame. Start your mower and see if it operates correctly. If so, you have got a bad seat safety switch and it needs to be replaced. This was only a troubleshooting procedure. You should never operate a mower with this switch disconnected, because you could be seriously injured. Go buy a new switch and replace it. You will need the make, model and serial number of the mower in order to get parts.

There is a small chance that either your clutch/brake safety switch or your PTO safety switch could also be at fault. Normally they won't go bad, but will just get out of posistion so that when you activate the clutch/brake they won

Posted on Dec 11, 2010

  • Dane Beckett
    Dane Beckett Dec 11, 2010

    Sometimes the clutch/brake won't engauge the switch. Just look at it and make sure it does. Need any more help, just let us know.. Thanks! Dane

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