1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 324Get this manual
LIGHTING SYSTEM EB805020
IELEC Iu I
LIGHTING SYSTEM CHECK 1.lf the headlight fail to come on:
1.Bulb and bulb socket Check the bulb and bulb socket for continuityCONTINUITY 2.Voltage Connect the pocket tester (DC 20 V) to the headlight couplers
NO CONTINUITY
Replace the bulb andor bulb socket