Cable system for a truck trailer

A cable system for a trailer, comprising:

• an electrically conductive power cable electrically connectable with one or more trailer components mounted to the trailer, wherein the one or more components include a vehicle tail lamp, or a vehicle turn signal lamp, and wherein at least one of trailer components includes:
• a component control circuit electrically connected to the power cable, the ground cable, and the communications cable;
• wherein the component control circuit is responsive to the commands sent by the master control circuit;
• and
• wherein the component control circuit is configured to selectively control operation of the at least one trailer component accordingly;
• an electrically conductive ground cable electrically connectable to the components of the trailer;
• a communications cable separate from the power and ground cables, wherein the communications cable is electrically connected to the trailer components;
• a master control circuit electrically connected to the power cable, the ground cable, and the communications cable, wherein the master control circuit is configured to generate and send commands to the trailer components via the communications cable;
• an adapter plug with multiple connection terminals corresponding to trailer connection terminals of a truck tractor, the multiple connection terminals including a ground cable connection and multiple power cable connections;
• wherein the master control circuit is electrically connected to the ground cable connection and the multiple power cable connections;
• and
• wherein the master control circuit is configured to determine the commands to send to the trailer components based on power received from the multiple connection terminals.