Abstract: A sidemarker light comprises a light housing, an EL slice and a fastening mechanism. The light housing includes a bottom plate having at least two through holes and a top cover coupled to the bottom plate. The EL slice includes a lighting portion and two conductive terminals. The fastening mechanism includes a pair of terminal receivers and a pair of plugs. Each terminal receiver has a terminal-buckling portion and a plug-buckling portion. The terminal-buckling portions are used to buckle the two conductive terminals. The plug has a coupling portion for being buckled by the plug-buckling portion and a through portion for passing through the through holes on the bottom plate.