Relays are extremely useful for handling high-amperage electrical accessories like large electric fans, fuel pumps, and HID headlights. They are activated by an electric coil and controlled by a switch. When the relay is closed, no power goes to the accessory in question. When you flip the accessory switch, an electric coil in the relay opens, sending power to the accessory.
Harnesses are wrapped in a protective covering and then routed and secured throughout the vehicle to protect them from damage. But life for vehicles can get tough. Constant vibration, flexing, exposure to heat and cold, water, ice, and salt can all eventually take a toll on the wiring. Wiring harness damage is also not unusual when a vehicle has been involved in a collision.
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