2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 337Get this manual
SIGNAL SYSTEM 2Neutral switch Check the neutral switch for continuityRefer to "CHECKING THE SWITCHES" Is the neutral switch OK? YES NO Replace the neutral switch3Voltage Connect the pocket tester (DC 20 V) to the indicator light coupler (wire harness side) as shownPositive tester probe brown Negative tester probe sky blue 2
EBS01083