Abstract: An apparatus is provided for simultaneously coupling a towing vehicle energizing circuit to a tow-dolly lighting circuit and a towed-vehicle lighting circuit. The apparatus includes a unitary connector body having a first portion for mating with an output plug of the towing vehicle energizing circuit, a second portion for mating with an input plug of the tow-dolly lighting circuit, and a third portion for mating with an input plug of the towed-vehicle lighting circuit. The connector body includes a plurality of conductors, each of which connects a terminal in the connector body first portion to corresponding terminals in each of the connector body second portion and third portion. The apparatus of the invention can be used to simultaneously connect the towing vehicle energizing circuit to two trailer end 4-flat plugs, one to power-tow-dolly lights and a second to power vehicle-in-tow lights.

Abstract: An apparatus provides for coupling a trailer lighting circuit including a light emitting diode to towing vehicle lighting circuit. The apparatus includes a connector having a first contact for coupling to a trailer lighting circuit input and a second contact for coupling to an electrical ground. The connector includes a resistive component coupled between the first contact and the second contact. The connector is configured to couple the first terminal to an output of the towing vehicle lighting circuit. The resistive component can include a resistor, an incandescent light or another component having suitable electrical resistance. The connector can be in various forms, including a trailer harness plug, a towing vehicle harness plug, or an adapter for coupling a towing vehicle electrical harness plug to a trailer electrical harness plug.

Abstract: An apparatus provides for coupling a trailer lighting circuit including a light emitting diode to towing vehicle lighting circuit. The apparatus includes a connector having a first contact for coupling to a trailer lighting circuit input and a second contact for coupling to an electrical ground. The connector includes a resistive component coupled between the first contact and the second contact. The connector is configured to couple the first terminal to an output of the towing vehicle lighting circuit. The resistive component can include a resistor, an incandescent light or another component having suitable electrical resistance. The connector can be in various forms, including a trailer harness plug, a towing vehicle harness plug, or an adapter for coupling a towing vehicle electrical harness plug to a trailer electrical harness plug.