APU Wiring Harness | Lockheed Martin Lockheed Martin is continuously improving the production aircraft based on field experience. Lockheed Martin’s improved APU Wiring Harness, currently installed on production aircraft, reduces the risk of corrosion due to water entrapment in the connectors. This improvement minimizes the need for costly repairs of these connectors and the associated electrical cables. APU Wiring Harnesses For Sale | MyLittleSalesman Shop APU Wiring Harnesses For Sale. Choose from listings to find the best priced APU Wiring Harnesses by owners & dealers near you.