2003 2005 YFM45FAR, YFM450FAR Kodiak OEM Service Manual, Page 360Get this manual
LIGHTING SYSTEM EB805021
2.If the taillight fails to come on: 1.Bulb and bulb socket
NO CONTINUITY
Check the bulb and bulb socket for continuityReplace the bulb andor bulb socketCONTINUITY
2.Voltage