2010-2011 Yamaha RS Vector / RS Venture Service Manual, Page 398Get this manual
LIGHTING SYSTEM TROUBLESHOOTING
HEADLIGHT ANDOR HIGH BEAM INDICATOR LIGHT DO NOT COME ONCheck the headlight bulb(s)OK NO CONTINUITY Replace the bulb(s)
Check the main fuse, ignition fuse, and headlight fuseRefer to "FUSE INSPECTION" in CHAPTER 2OK FAULTY Replace the main fuse, ignition fuse, andor headlight fuse
Check the batteryRefer to "BATTERY INSPECTION" in CHAPTER 2OK OUT OF SPECIFICATION Replace or charge the batteryRefer to "BATTERY INSPECTION" in CHAPTER 2