2003 Kawasaki KLF250 Service Manual., Page 264Get this manual
16-22 ELECTRICAL SYSTEM Charging System
Alternator Inspection
three types of alternator short, open, There arerotor magnetismA short failures: in one of the or loss in or open coil wies will result in either low output, or no output at allA loss in rotor magnetism, which may be caused by dropping or hitting the alternator, by leaving it near an electromagnetic field, or just by aging, will result in low outputTo check the alternator output voltage, perform the following proceduresDisconnect the alternator connector [A]Connect hand tester as shown in the tableStart the engineRun it at the rpm given in the tableNote the voltage readings (total measurements)
Alternator Output Voltage Tester Range 250 AC Connections Tester (+) to One yellow lead Tester (-) to Another yellow lead Reading 000 rmin (rpm) 38 or more