Carmakers including Germany’s Volkswagen, BMW and Porsche are struggling to obtain crucial wire harnesses as suppliers in western Ukraine have been shuttered by the Russian invasion, forcing them to curtail production. Production of the part, needed for organizing miles of vehicle cables, has affected suppliers like Leoni, Fujikura and Nexans, and rippled through to major carmakers. Delivery bottlenecks have already hit some assembly plants of world No. 2 automaker Volkwagen, while Porsche’s luxury unit has suspended production at its Leipzig plant. Rival BMW has also been affected. “Due to supply bottlenecks, interruptions to our production will occur,” BMW said in a statement. “We are in intensive discussions with our suppliers.” A wire harness is a vital set of parts which neatly bundle up to 5 kilometres (3.1 miles) of cables in the average car. Unique to each car model, vehicles cannot be built without them. Suppliers like Leoni, which has …