I'd guess that you have both your AC and DC grounded somehow. When I look at the wiring diagram from the original document (figure 22) it shows the AC going into the Reg./Rect. as connected between stator white and chassis ground. So far so good since the instructions indicate this is intended to be a DC conversion WITHOUT floating the stator ground.
In order to be successful the RR output must not be grounded. Note that the diagram shows battery minus and "ground with bullet". This is meant to indicate that battery minus is the isolated ground point for the lighting. IT DOES NOT GET CONNECTED TO CHASSIS/FRAME GROUND. Check to see if your battery minus is grounded. If so remove that ground and see if it works.
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2011 EC250E
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