Abstract: An auxiliary U-turn signal indicating light attachment having a generally U-shaped housing designed to be mounted on the lower left corner of the rear window of a vehicle, wherein an indicating light compartment encloses a U-turn signal indicating lamp. A manually operated switching apparatus for energizing the U-turn signal lamp is adapted for mounting on and interconnection with a conventional turn signal lever. A mounting bracket is pivotally secured to a rod slidably received within an apertured mounting tab within the housing, wherein a set screw associated with the mounting tab is utilized to secure the rod in a selected adjusted position. By virtue of this arrangement, the elevation and inclination of the housing on the intended mounting surface can be varied to enable usage with a wide variety of differently configured vehicles.