An interface board for use, for example, in a motor vehicle to provide electrical interconnection between a plurality of electrical circuit control elements and a wiring harness. The board comprises a box structure including a plurality of circuit outlets on the upper face of the structure for plug in receipt of the electrical circuit control elements, a plurality of power outlets on a lower face of the structure for plug in receipt of electrical power input and output elements, and a series of electrical paths extending between the power outlets and a circuit control outlets. Each electrical path includes a first conductor extending generally parallel to the first and second faces and second conductors extending generally perpendicular to the first and second faces. The first conductors comprise flat ribbon elements and the second conductors comprise flat ribbon elements connected to the flat sides of the first conductors utilizing clinch joints.