Abstract: An add-on vehicle light monitor includes a light pipe formed of a light coupling transparent material and having an input end and an output end. The light pipe is configured to be supported upon the vehicle body at a position in which the input end is approximate to the to-be-monitored light source and the output end is viewable by the vehicle driver or operator. In one embodiment, an aperture is formed within the vehicle taillight lens to permit the input end to be inserted into the vehicle light assembly. In an alternate embodiment, the input end is fabricated so as to be flush mountable to the light assembly lens without the need for forming an aperture therein.