A vehicle lighting system, for use in automobiles or trucks has a tail lamp relay, connected so electrical current flows through the vehicle battery, a tail lamp, and the tail lamp relay when the relay is on; a tail lamp switch; a battery low voltage sensor; taillamp programming means; and means for...http://www.google.de/patents/US5592146?utm_source=gb-gplus-sharePatent US5592146 - Programmable vehicle light controller
