Kohler Lawn Mower Dies? Voltage Regulator/Rectifier 4140310-S



This video provides step-by-step instructions for replacing the voltage regulator/rectifier on single cylinder Kohler Command small engines, commonly found on riding lawn mowers, riding tractors, zero-turn radius mowers, and commercial walk-behind mowers. The most common reason for replacing the regulator/rectifier is when the battery keeps draining.

Click here to purchase Part #4140310-S: https://www.repairclinic.com/PartDetail/Voltage-Regulator/4140310S/1602773?TLSID=1876

Additional small engine repair, troubleshooting tips, help with finding your model number, and part replacement videos: https://www.repairclinic.com/RepairHelp/Small-Engine-Repair-Help?TLSID=1876

All of the information in this regulator/rectifier replacement video is applicable to the following brands: Kohler, Exmark, Toro, John Deere

Tools used: socket wrench

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6 thoughts on “Kohler Lawn Mower Dies? Voltage Regulator/Rectifier 4140310-S

  1. Mine puts out 21 Volts! So I replaced this module, double checked the ground and even double grounded it for temporary. Again 21V !! What gives? The old regulator was definitely bad, one of the "A" terminals is shorted to it's metal housing internally.

  2. Typically what should be the output on the rectifier in DC volts? I have a Briggs and Stratton with a 10 amp regulated charging system.

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