2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 320Get this manual
ELECTRIC STARTING SYSTEM EBS01052 EBS01053
4Starting circuit cut-off relay Remove the starting circuit cut-off relay from the wire harness Connect the pocket tester1) and battery (12 V) to the starting circuit cut-off relay as shownPositive battery terminal redblack Negative battery terminal sky blue or blackyellow Positive tester probe redblack Negative tester probe yellowblack 4
5Starting circuit cut-off relay (diode) Remove the starting circuit cut-off relay from the wire harness Connect the pocket tester1) to the starting circuit cut-off relay as shown Measure the starting circuit cut-off relay for continuity as followsPositive tester probe sky blue Continuity Negative tester probe redblack Positive tester probe redblack No Negative tester probe continuity sky blue 1