2004-2006 (2007) Honda TRX400FA Fourtrax Rancher / TRX400FGA Rancher AT GPScape Service Manual, Page 386Get this manual
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BATTERYICHARGING SYSTEM
YES NOFaulty regulatorrectifierShorted wire harness Faulty ignition switch
4 Alternator Charging Coil Inspection Check the alternator charging coil (page 19-