A method of forming an electrical cable assembly includes providing a multiconductor flat cable comprising wires arranged in a coplanar fashion with each other and encased within a planar dielectric structure, cutting a slot in the planar dielectric structure intermediate the wires, thereby forming wing features in the dielectric structure extending from the wires, removing portions of the dielectric structure from ends of the wires, wherein portions of wing features remain, attaching the exposed wires to terminals, wherein the terminals define prongs, and attaching the portions of the wing features to by inserting the prongs within holes defined in the portions of the wing features, thereby retaining the wires to the terminals.