2004-2006 (2007) Honda TRX400FA Fourtrax Rancher / TRX400FGA Rancher AT GPScape Service Manual, Page 391Get this manual
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SATTERYICHARGING SYSTEM
STANDARD: 0.11.0 (at 20C68F)
Check for continuity between each Yellow wire terminal of the alternator side connector and groundThere should be no continuityReplace