2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 416Get this manual
BATTERYCHARGING SYSTEM BATTERY LINE Measure the voltage between the Red wire terminal of 3P (Black) connector and groundThere should be battery voltage at all timesGROUND LINE Check the continuity between the Green wire terminal of 3P (Black) connector and groundThere should be continuity at all timesCHARGING COIL LINE Measure the resistance between the Yellow wire terminals of 3P (GRAY) connectorSTANDARD: 0.1 1.0 (at 20C68F) 3P (BLACK) CONNECTOR 3P (GRAY) CONNECTOR