What is the polarity of an automotive accessory cigarette socket?

Answer by  electroman (337)

The very bottom center of the socket is the positive 12 volt lead, the outside portion of the socket is actually the negative, or ground. This is why the accessory plug has a spring loaded center conductor and a wire-looking hook on each side.

Answer by  Chucko (103)

A fairly loaded question for sure. Most repairs/replacements on this level are not safe for novices to perform, consult your car manual or speak with a licensed mechanic before hand.

Answer by  garymarkle (599)

Power ports are center positive, and shell negetive. There are two common sizes; 21mm, and 22.2mm, you should be able to tell what you have by reading owners manaul.

Answer by  dicaprio (24)

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.

Answer by  laura27 (1216)

Very bottom of socket is positive 12 volt lead. Outside portion of socket is negative or ground. Accessory plug loaded spring center conductor with wiring looking hook on each side.