Keep in mind that voltage regulation is different than voltage rectification. Regulation is done anywhere in the system as it's only clipping maximum voltage. A simple method is to use a zener diode since it converts the extra energy into heat. It has a specific threshold voltage thus preventing your bulbs from burning out. Just replace your stock regulator (assuming the wiring is correct).
A voltage rectifier has definite input and output wiring. It changes AC to DC and thus does more work. It also performs voltage regulation. With rectification you have to be concerned about grounding (floating with full wave vs non-floating with half-wave).
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2011 EC250E
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