White wire is stator full AC output intended to be rectified/regulated for DC battery charging. Would not be connected to anything on your bike.
Yellow wire is stator reduced AC output intended to be regulated for lighting.
The bottom of the windings is chassis/frame ground. Thus you need to work with the yellow and ground to get your lights operating. Follow the yellow wire everywhere and it should wind up at the headlight switch. Comes out of the switch and goes to the LO headlight bulb. Other side of the bulb goes to ground. Engine has to be running for the lights to work.
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2011 EC250E
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