2001 Yamaha YFM660 Raptor Factory Service Manual, Page 312Get this manual
SIGNAL SYSTEM EB806024
2.If the neutral indicator light fails to come on: 1.Bulb and bulb socket
NO CONTINUITY
Check the bulb and bulb socket for continuityCONTINUITY Replace the bulb andor bulb socketNO CONTINUITY
2.Neutral switch Refer to "CHECKING THE SWITCH"CONTINUITY