Join Date: Mar 2012
Location: Chippewa Falls, WI
Headlight out + Check Engine light on = Bad Regulator/Rectifier
I replaced my headlight once with under 6000 miles. Headlight was out again and Check Engine light came on. Bike seemed to run fine. Service code was "overvoltage", some 18V out of regulator/rectifier.
Just a heads up to 2008 Kingpin owners. Sucks when you're on a road trip and in the middle of nowhere and Check Engine light comes on. Thankfully, the high beam light worked to get me home in the dark after dinner.
Have your regulator/rectifier checked if your headlight has ever gone out.