Junction box and wire harness connection method

A method of connecting a junction box and wire harness comprising:

• providing an insulator board having electrically conductive material in a form of strips arranged in parallel in a Y-axis direction;
• stripping insulation from one end of each of a plurality of electrical wires such that each wire includes a first end having an exposed core and a second end having a terminal;
• arranging at least two wires in an X-axis direction adjacent a surface of the insulator board, the at least two wires being oriented so as to cross the strips;
• connecting the exposed core of one of the at least two wires to one of the strips through a window provided in the insulator board;
• connecting the exposed core of another of the at least two wires to another of the strips through another window provided in the insulator board;
• gathering the wires and inserting the terminals on the second ends of the at least two wires into a connector so as to form multiple wire harnesses after the exposed cores are connected to the strips;
• and
• installing the insulator board and the at least two wires into a case structure having an opening on a side thereof so that the at least two wires with connectors connected thereto extend outward and away from the case through the opening,
• wherein the connecting the exposed cores of the at least two wires includes individually and separately welding the exposed core of each wire to the respective strip such that the at least two wires are fixedly attached to the circuit assembly by the welded exposed cores and the terminals of the wires are flexibly unattached.