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Just in case someone reads this thread later so that they can figure out how to wire up their circuit:
DO NOT WIRE A TAILLIGHT DIRECTLY TO A DYNOHUB AS SHOWN IN THE DRAWINGS IN THE TWO PREVIOUS POSTS ! ! !
Most taillights do not have the overvoltage protection needed, but the headlights do. Thus, you wire the taillight to the headlight, that way the headlight protects the taillight from overvoltage as the taillight power comes through the headlight circuitry. The overvoltage occurs when you go down a hill at higher speed. The headlight instructions should tell you how to wire your taillight to the headlight.
Instead think of the above drawings as showing headlights, not taillights, then it would be correct.