1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 330Get this manual
SIGNAL SYSTEM 2.1f the reverse indicator light fails to come on: 1.Bulb and bulb socket Check the bulb and bulb socket for continuityCONTINUITY NO CONTINUITY
IElEC 10 I
Replace the bulb andor bulb socket
2.Reverse switch Refer to "SWITCH INSPECTION"CONTINUITY
NO CONTINUITY
Replace the reverse switch
3.Reverse relay Remove the reverse relay from the wire harness Connect the pocket tester (0 1) and battery (12 V) to the reverse relay terminals