1993-2000 Honda TRX300EX Service Manual, Page 162Get this manual
Abnormal Check the voltage between the regulatorlrectifier battery charging line and ground line (page 14-07)Open circuit in wire harness Poorly connected connectors
ConnectionRed (+)GreenBlack (- StandardBattery voltage
Normal Abnormal Check the alternat or (charging coil) resistance at the alternator connector (page 14-81Faulty alternator