Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Engine has an alternator/stator coil under the flywheel. This and the voltage regulator are what charges the battery With it sometimes working, I think you have a bad voltage regulator and needs to be replaced/
Replacing the voltage regulator is just a matter of disconnecting the battery negative cable and then removing the regulator and installing a new one. Wire harness just plugs into it. and it is mounted on the outside of the engine.
# 200 in the link above is the regulator.
Here is regulator as used on a similar Deere model. Yours will look and mount like this. See picture below.
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