Mold for assembling and forming wire harness

A mold for assembling and forming a wire harness preferably includes wire supports extending into a continuous trough which forms a main trunk and a plurality of branches extending from the main trunk. A port introduces a generally liquid sheath material into the trough of the mold. Wires are routed on the wire supports along the main trunk and branches of the trough in the mold. The sheath material is then introduced into the mold and cures around and among the plurality of wires.