Simplest test is to leave it on the engine, battery hooked up normally. Run the engine at normal full speed (not just idling) and use your voltmeter to measure the voltage across the battery with your DMM. If you measure 13.5 to 14 volts, your rectifier/regulator is probably OK.
It can't easily be tested off the mower. You'd need a source of AC at 24 volts to simulate the motor's stator winding, and a load that draws about 23 amps at 12 volts.
Don't forget a bad battery can cause failure to charge - it's not always the regulator.
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