Avoid accidents and tickets by installing the Black Bull 12 Volt trailer light kit. This set of high visibility safety lights include a pair of multi-function tail lights, side marker lights, fasteners and connectors. This kit includes everything you need to install a safe and permanent tow light system. A 20 foot wiring harness with a 4-pin connector allows for towing cars, boats, trucks or trailers up to 80 inches wide.