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by Lantash on October 19th, 2005

Lantash

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What is the polarity of an automotive accessory socket, such as a lighter or power port?

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Answers. 2 helpful answers below.

  • by 8 Jan 2004-10 Dec 2009 on October 27th, 2005

    8 Jan 2004-10 Dec 2009

    The cigarette lighter/power port is center-positve, shell-negative.

    FYI - there are also TWO common sizes; 21mm and 22.2mm. That 1.2mm may or may not make a difference, depending on the way the springs on the outside of the plug (the negative contacts) are constructed.

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  • by bjmellon on October 21st, 2005

    bjmellon

    DC. If you want to use an AC device, like a hair dryer, buy a power inverter. Power inverters use the 12 volt dc from a vehicle and change it to 110 AC. I assume thats what you meant by polarity. If not, the bottom center of a lighter socket is the positive, the rest is negative.

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