2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 392Get this manual
LIGHTSMETERSSWITCHES
CARBURETOR HEATERCARBURETOR HEATER SWITCH
SYSTEM INSPECTION
Remove the carburetor heater switch 2P red connector from the frame under the front fender and disconnect itConnect the wire harness side connector terminals with jumper wire
Remove the carburetor heater 2P natural connector from the frame under the rear fender and disconnect itMeasure the voltage between the Brown (+) and Green (-) wire terminals of the wire harness side connectorThere should be battery voltage with the ignition switch turned to ONIf there is no voltage, check for an open circuit in the wire harness
2P NATURAL CONNECTOR