2005 Kawasaki KAF400 Mule 600 and Mule 610 4x4 Service Manual, Page 357Get this manual
ELECTRICAL SYSTEM 16-27 Charging System
Regulator Circuit Test-1st Step: Connect the test light and the 12 battery to the regulatorrectifier as shownCheck GW1 and GW2 terminals respectively
CAUTION
The test light limits the current flow through the regulatorrectifierDo not use an ammeter or multimeter in its placeIf the test light turns on, the regulatorrectifier is defectiveReplace itIf the test light does not turn on, continue the test