A custom wiring harness is an assembly of electrical cables and wires which are used to connect components in a wide variety of applications. Wiring harnesses can be found in everything from cars and motorcycles, to home entertainment systems and even industrial equipment. They provide a convenient way for manufacturers, engineers, designers, and DIY enthusiasts alike to connect multiple components together without having to worry about complicated wiring diagrams or soldering joints. Custom wiring harnesses also help reduce the amount of time it takes to build complex circuits by eliminating the need for dozens of individual wires that must be attached manually. Additionally, they are often more reliable than traditional methods because they use connectors that create secure connections between parts – meaning there is less chance of error or failure over time.