2003 Kawasaki KLF250 Service Manual., Page 263Get this manual
ELECTRICAL SYSTEM 16-21 Charging System
RegulatorRectifier Output Voltage Inspection
Remove the seat (see Frame chapter)section)the battery condition (see Battery Check up the engine to obtain actual alternator operating Warm conditionsthat ignition switch is turned Checktesterthe the battery terminalsoff, and connect hand to
Special ToolHand Tester57001-1394 RegulatorRectifier Output Voltage Tester Range 25 DC Connections Tester (+) to Battery (+) Tester (-) to Battery (-) Reading 000 rmin (rpm) 14 15 V