Learn how to wire aviation plugs (GX12, GX16, GX20, GX25) with clear diagrams, pin mapping, soldering tutorials, assembly instructions, and testing methods for reliable industrial wiring. This advisory circular (AC) provides guidance for developing an electrical system standard wiring practices document for air carriers, air operators, holders of type certificates (TC), holders of supplemental type certificates (STC), maintenance providers, and repair stations. This guide provides a complete, illustrated, engineer-ready tutorial on wiring aviation plugs such as GX12 / GX16 / GX20 / GX25. Advisory circulars should. Interconnecting wire is used in point-to-point open harnesses, normally in the interior or pressurized fuselage, with each wire providing enough insulation to resist damage from handling and service exposure. Electrical wiring is often installed in aircraft without special enclosing means., retain the identity of the group within a bundle by spot ties, as shown in Figure 4– 1. Electrically Unprotected Wiring. Those wires (generally from generators to main buss distribution points) which do not have. This is a very large document that the OEM writes prior to designing the aircraft. Some of that information includes wiring harness design.