2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 31Get this manual
GENERAL INFORMATION '04'05: IGNITION SWITCH 4P (BLACK) CONNECTOR
HANDLEBAR SWITCH 4P CONNECTOR
HEADLIGHT 3P CONNECTOR
After '05: DIODE (TRX450ER only) TRX450ER: COOLANT TEMPERATURE NEUTRAL INDICATOR 4P CONNECTOR TRX450R: COOLANT TEMPERATURE 2P (RED) CONNECTOR