Don't assume that the 2018 XC uses AC for the headlamp. Go to gasgas.com and download the manual for your bike. Page 17 has the wiring diagram that shows the stator connected to the regulator (rectifier).
The "generador" connector shows AC output from the stator. There is no detail on the stator itself. AC power from the stator does not appear to go anywhere other than the regulator/rectifier.
The only thing we can tell is that battery minus is grounded and the starter motor is grounded. Also the yellow/green from the regulator/rectifier is grounded. The red wire from the rectifier is connected at various places on the bike.
Ro which is red appears to connect to the common terminal of the headlight switch. Thus the headlight may be DC powered. Have fun following the diagram to see if you reach the same conclusion.
Don't trust the diagram to be true unless you can measure DC voltage at the headlight.
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2011 EC250E
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