Aluminum: The Wiring Material of the Future Nov 10, 2014The wiring harness is one of a vehicle’s heaviest components. Lightweight aluminum wiring can replace heavier copper wires in the wiring harness, but aluminum is a demanding material. To ensure reliable electrical contacts over time, the connector technology must be designed specifically for stranded conductors made of aluminum. Wire Harness in Cars: Copper or Aluminum Terminals of a wire harness generally use brass or copper alloys. When copper terminal are used with aluminum wire, galvanic corrosion will occur. Anyway, the trend is still toward aluminum wires. Manufacturers such as Delphi are researching to overcome the problems with using aluminum wires.