2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 502Get this manual
LIGHTSSWITCHES (After '05)
IGNITION SWITCH
INSPECTION
Remove the top cover (page 3-5)Disconnect the ignition switch 4P black connectorCheck for continuity between the switch side connector terminals in each switch positionContinuity should exist between the color coded wires as shown below:
Color Position OFF ON
Black Green white