2001 Yamaha YFM660 Raptor Factory Service Manual, Page 309Get this manual
SIGNAL SYSTEM EB806010
TROUBLESHOOTING IF THE TAILBRAKE LIGHT ANDOR INDICATOR LIGHT FAILS TO COME ON:
Procedure Check: 1.Fuse 2.Battery 3.Main switch 4.Wiring connections (the entire signal system)
OTE: Remove the following part(s) before troubleshooting: 1)Seat 2)Front fender 3)Rear fender Use the following special tool(s) for troubleshooting
Pocket tester: PNYU-03112, 90890-03112