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Automotive glossary

12-volt Socket (Accessory Socket)

The 12-volt socket supplies power for accessories like chargers and coolers.

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What is 12-volt Socket (Accessory Socket)?

It is the former cigarette lighter socket. It is fused. Some work only with ignition on. Sockets are usually limited by a fuse to around 10 to 15 amps, so high-power devices like compressors may blow it. Many newer cars also have USB-A and USB-C ports. Leaving devices plugged in can slowly drain the battery if the socket stays powered with the ignition off.

How it works

The socket connects to the 12-volt system.

Why it matters for your car

High loads can drain the battery. Blown fuses stop it working.

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