An aftermarket vehicle turn signal assembly and a method of retrofitting the turn signal assembly to a grille of a vehicle are disclosed. The turn signal assembly enables users to customize their vehicles by repositioning a turn signal from a factory original fender location, for example, to an aftermarket opening formed on the grille. Using special drill templates designed for a specific vehicle, a user can locate a position for a hole, and later drill a hole into the grille of a vehicle. A user can then insert an aftermarket turn signal assembly into the hole, and secure the turn signal assembly to the grill. The user can then remove the factory original turn signal light source from the original fender location, and place the light source within the aftermarket turn signal assembly.