USA Made Auto Restoration Wiring | Kwik Wire | Electrify Your Ride 50% Off Loom Kit with Wire Harness Purchase. Menu Cart 0. Wire Harnesses +-All Wire Harnesses; Complete Wiring Kits Accessory Wiring 14 Circuit VW Wire Harness. 14 Circuit Wire Harness. Regular price $375 20 Circuit Wire Harness. Regular price $425 Automotive Wire Size Calculator – Wire Gauge Chart | MGI SpeedWare Choosing the correct gauge automotive wire depends on the acceptable voltage drop, length of the feeder/branch circuit conductor, load amperage, and the ambient temperature of the compartment where the primary wire will pass through. Outside engine compartments, the ambient temperature should generally be 20°C. Choose a higher ambient temperature when