2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 393Get this manual
LIGHTSMETERSSWITCHES
COMBINATION METER (Except ACM type TM model)
POWERGROUND LINE INSPECTION
Remove the front fender (page 3-9)Remove the combination meter 14P gray connector from the frame and disconnect itCheck the following at the wire harness side connectorPOWER INPUT LINE Measure the voltage between the Blackbrown wire terminal (+) and ground (-)There should be battery voltage with the ignition switch turned to ONIf there is no voltage, check for an open circuit in the wire harnessBACK-UP VOLTAGE LINE Measure the voltage between the Redblack wire terminal (+) and ground (-)There should be battery voltage at all timesIf there is no voltage, check for an open circuit in the wire harnessGROUND LINE Check for continuity between the Green wire terminal and groundThere should be continuity at all timesIf there is no voltage, check for an open circuit in the wire harness14P GRAY CONNECTOR