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As dariv said any difference in stator output voltage between open circuit and load will be negligible. How accurate does the measurement need to be? Low cost DVMs are typically about 1 - 2 % accurate for a DC measurement. For AC RMS measurements they are designed for accuracy for a 60Hz sine wave. So the measurement of any AC waveform that differs from 60Hz or is non-sinusoidal will have increased error. How much error depends on the design of the meter and the characteristic of the stator output waveform. For our stator check purpose it doesn't matter. Even 10-15% error is probably accurate enough.
If you have a meter, the health of the stator should really be checked as stated in the Kaw service manual. (0.3-0.5 ohm winding resistance; open to ground). The 100W light bulb check is probably a good quick check for those that don't have a meter.
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