2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 378Get this manual
SIGNAL SYSTEM EB806010
TROUBLESHOOTING IF THE BRAKE LIGHT ANDOR INDICATOR LIGHT FAILS TO COME ON: IF THE HORN FAILS TO SOUND:
Procedure Check: 1.Fuse (main, ignition, signaling system) 2.Battery 3.Main switch 4.Wiring connections (the entire signal system) NOTE: Remove the following part(s) before troubleshooting: 1)Seat 2)Fuel tank 3)Air cleaner case 4)Front carrier 5)Front fender panel Use the following special tool(s) for troubleshootingPocket tester: PNYU-03112, 90890-03112