2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 442Get this manual
LIGHTSMETERSSWITCHES
ASSIST HEADLIGHT
BULB REPLACEMENT
Remove the screwRelease the four tabs of the assist headlight upper cover from the slits in the front and lower coversDisconnect the breather joint hose from the upper cover and remove the coverTABS HOSE UPPER COVER
SLITS Disconnect the assist headlight connectorRemove the retaining ring by turning it counterclockwise and remove the bulb from the headlightInstall new bulb and removed parts in the reverse order of removalBULB
RETAINING RING