Adapter for selecting lamp function in a truck trailer

An adapter for use with components of a trailer, comprising:

• a Printed Circuit Board (PCB) that includes:
• a power terminal passing through the PCB from a first side to a second side that is configured to contact a corresponding power terminal of a trailer component socket;
• a ground terminal passing through the PCB from the first side to the second side that is configured to contact a corresponding ground terminal of the trailer component socket;
• and
• multiple mode selection terminals on the second side of the printed circuit board, wherein the multiple mode selection terminals are arranged on the PCB to align with and make contact with corresponding mode selection input terminals of a trailer component positioned in the trailer component socket;
• traces arranged in fixed positions on the PCB, the traces electrically connecting at least some of the multiple mode selection terminals to the power terminal or the ground terminal by virtue of the position of the traces on the PCB;
• wherein a mode selection is permanently fixed according to the position of the traces on the PCB board;
• and
• wherein the trailer component includes control logic configured to activate and deactivate the trailer component according to the electrical connections to the power and ground terminals and the multiple mode selection terminals.