If a single cylinder ohv Briggs its likely a 3 amp unregulated stator. This is all a guess without engine numbers. There are 2 wires coming out from under the flywheel to a white plug. One of the wires has a length of heat shrink over a bulge just before the plug. This is a diode. The diode changes the ac output of the stator to dc and charges the battery. The other wire remains ac and powers the headlights when the engine is running. Test the charging system with a dc voltmeter, positive lead on the wire with the diode, negative lead to a good chassis ground. With engine running at 3/4 throttle you should get a reading of at least 12.7 volts.
If any other configuration I would need model, type, and code off the motor to help diagnose. Also wondering why you question the charging system since they are pretty much bullet proof.
SOURCE: charging wireing diagram on craftman 42'' riding lawn mower 19.5'' briggs motor
the charging system runsfrom a stator which is underneath the flywheel and runs to a rectifier/regulator module and to the battery. it will power the blades if it is an electric clutch system and also the fuel plunger system on the carbuerator
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