apparatus for changing the order of wires in an array of wires being assembled into an electrical harness consisting of an auxiliary gripper 250 for individually gripping the ends of wires projecting from a guide 203a and a crossover gripper 252 for withdrawing a wire from the auxiliary gripper and the guide and locating it in a different wire position in the auxiliary gripper and guide . to allow for changing over wire a second crossover gripper 256 is provided each crossover gripper preferably having an associated tip gripper 254 , 258 to guard against wire curl .