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Add accessory power that’s ignition switched or constant (vehicle dependent) to operate 12-volt accessories. Modern cars use a complex CAN bus system to communicate within the factory system. This will provide a safe connection point that will not interfere with other OEM systems. This location is located behind the power port / 12v cigarette socket. Our T-harness is used to add accessories without causing potential damage to the factory's electrical system. The harness allows you to wire accessories switched on and off with the ignition key or stay constant if the factory power outlet is constantly powered. This harness is a “plug and play” wire harness.