2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 399Get this manual
2WD4WD SELECTING SYSTEM
C0NTINUITY
6.Four-wheel drive relay Remove the four-wheel drive relay from the wire harnessConnect the pocket tester1) and the battery (12 V) to the four-wheel drive relay terminalsBrownRed terminal Tester () lead YellowBlack terminal Battery (+) terminal BrownRed terminal Battery () terminal YellowBlack terminal Tester (+) lead BlueRed terminal Tester () lead Gray terminal 4