An auto wire harness is the main electrical network in your car. It connects all the digital and electrical systems. This helps each part work together. The wire harness sends electrical power and data. It moves these between the battery, sensors, lights, and safety features. Modern cars use about 40 split harnesses. These help with complex things like entertainment and safety. If you know why wire harnesses matter, you can find problems early. This helps keep your car safe. Problems with the wire harness cause many electrical failures, as shown below: