Richard Johnson

TL;DR: An electrical trailer plug device for connecting a trailer electrical system to a tow vehicle electrical system is described in this paper, which includes a first electrical connector configured to connect an electrical current path of the vehicle electrical systems to an electrical circuit supplying electricity from the vehicle Electrical System to one or more trailer lamps supported on the trailer.

TL;DR: In this paper, a dual operational and stop light control for adapting combined stop and turn signal lights on a trailer to independent stop signals and turn signals on a towing vehicle has been presented; the adaptor has a pair of switching circuits, each including a PNP transistor connected in series with an NPN transistor to chassis ground.

TL;DR: An electrical taillight adapter circuit (6) interfaces a three-lamp vehicle lighting circuitry with a two-light trailer lighting circuitry (6), which operates in response to signals generated by the vehicle operator, and are electrically connected to the adapter circuit as discussed by the authors.