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It is much better to run a generator under load even when doing monthly exercise, prolonged repetitive exercise runs without load and without giving the generator time to come up to temperature is a recipe for wet stacking and carbon build up as well as breakdown of engine oil. Having said that...

When you idle the voltage regulator goes to full output on the excitation coils trying to maintain output voltage, this in turns causes the voltage regulator to burn out, most often the component that fails first is the output transistor. So it is NEVER a good idea to idle these units on start...