Things to keep in mind: The stator puts out only AC voltage, you can't measure DC there. White to ground is full output, yellow to ground is slightly less output.
Your lighting operates on AC voltage (yellow wire). The rectifier/regulator clips the AC voltage to keep your bulbs from burning out. It also provides some DC power for battery charging (sourced from the white wire). You need the engine running to create AC voltage, it should measure about 15VAC.
You can check resistance values for the stator (wires disconnected) to see if it is funtional.
My notes are based on the 2011 wiring, yours might be slightly different. Follow the colors in your specific wiring diagram. You need the exact diagram for your bike. Estart bikes are wired differently than non-estart bikes.
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2011 EC250E
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