2007-2009 Honda TRX300EX TRX300X service manual, Page 310Get this manual
BATTERY CHARGING SYSTEM
TROUBLESHOOTING
Battery is Damaged or Weak 1Battery Test Remove the battery (page 16-6)Check the battery condition using the recommended battery testerRECOMMENDED BATTERY TESTER: BM-210-AH (U.S.Aonly), BM-210, BATTERY MATE (MTP08-0192, U.S.Aonly) or equivalent
Is the battery in good condition?
NO YESFaulty batteryGO TO STEP 2
2Current Leakage Test Install the battery (page 16-6)Check the battery current leakage test (Leak test: page 16-6)
Is the current leakage below 0.1 mA?
YES NOGO TO STEP 4- GO TO STEP 3
3Current Leakage Test without RegulatorRectifier Disconnect the regulatorrectifier connector and rech eck the battery current leakage
Is the current leakage below O7 mAl
YES NOFaulty regulatorrectifierShorted wire harness Faulty ignition switch
4Alternator Charging Coil Inspection Check the alternator chargi ng coil (page 16-8)