Wiring harnesses are pre-assembled electrical cabling systems delivering power and signals throughout the vehicle, typically concealed within the chassis, engine compartment, and interior. They consolidate individual wires into a single, organized unit, utilizing connectors for modular component integration and repair. Harnesses employ specified wire gauges, insulation types, and shielding to meet amperage, voltage, and environmental demands. Construction incorporates overmolding, taping, and sleeving for durability and protection against abrasion, heat, and fluids. Modern designs increasingly integrate CAN bus and other data network wiring for vehicle communication.