2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 503Get this manual
LIGHTSSWITCHES (After '05) See page 24-8 for Check for continuity between the switch side conclutch switch nector terminals in each switch positionDIMMER inspectionContinuity should exist between the color coded wires as shown below:
ENGINE STOP SWITCH COLOR Green Blackwhite LIGHTTING
STARTER LIGHTING SWITCHDIMMER SWITCH ENGINE STOP