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I have a Craftsman 16hp Lawn Tractor. Problem, battery will not stay charged up when the mower is being used, even with a new battery. If you shut the mower off, and then try to re-start it, you are in trouble

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Your mower is not charging the battery. Something is wrong with the charging system. It more than likely uses a magneto type charging system. It is mounted under the flywheel. Unless you are adept at repairing these take it to a pro.

Posted on Apr 04, 2011

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Response to the above answer> magneto charging system? really dude? magneto is the armature for the timing.. get it right or dont post here.. stator \ alternator is the right answer and yes it is located underneath the flywheel. most higher HP Briggs are what they call direct circuit charging systems and no regulators.

if you replace the Battery and it does not charge you need to test the stator or as I call it the alternator with a multi tester.the stator is located underneath the fan\flywheel and requires a fly wheel puller to pull off fly wheel and to bolt new stator underneath.but i would test it with a multi meter first.stators are about 50 new.you will see the red wire for stator coming out of engine about midway down unplug it and test it. note there is a diaode in the one lead that could be the issue but most times its copper wire broke on stator its self.

Set the multi-tester dial to AC VOLTS or DC AMPS.
Insert the black multi-tester lead into the tester's COM receptacle.

  • For AC VOLTS, connect the other end to ground, such as an engine bolt or cylinder fin.
  • For DC AMPS, connect the other end to the battery's positive terminal. (NOTE: The battery must be grounded to the equipment frame of the engine block to create a complete circuit.)
  • Insert the red lead on the multi-tester into the tester's receptacle (labeled AC VOLTS or AMPS).
  • Connect the red lead to the appropriate stator output wire.
  • go to this link on the briggs site for youre engine so you know what volts or amps are good. also note that some lower HP briggs engines have a regulator that they threw in the mix and I believe any engine below 16hp does have a regulator so it would be need to be tested as well.any engine over 16hp has a battery and stator and no regulator.
  • http://www.briggsandstratton.com/us/en/support/faqs/charging-system-alternator-test

    Posted on Jun 29, 2015

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