A wiring harness has many connectors that can serve as an extension to the main harness which allows routing to devices which are located beyond the reach of the main harness.
The same goes for fastening wires to reduce their movement. A wire allowed to dangle on an exhaust manifold isn’t long for this earth. Dirt and vibration conspire to wear through wire fanned out on a floorboard. More than one amplifier screw has self-tapped its way through stray wires.
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