Based on the age of your bike I'd guess stator corrosion is the problem. Does it make any difference if you disconnect the voltage regulator? I would expect no change since the regulator only clips excess voltage.
Chances are the lighting windings are cooked or corroded through. Get yourself a puller and expect to replace the stator. There are resistance values to check to help point you in the right direction. Others have purchased a KTM stator and changed the connections.
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2011 EC250E
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