1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 341Get this manual
2WD4WD SELECTING SYSTEM
4.2WD4WD select switch Refer to "SWITCH INSPECTION"CORRECT
INCORRECT
1Replace 2WD4WD select switch
5.Gear motor Check that the shift fork sliding gear is in the 2WD position Disconnect the gear motor coupler Remove the gear motor from the differential gear case Connect the battery (12 V) to the gear motor terminalsBattery (+) terminal Brown terminal Battery (-) terminal Sky blue terminal