What side is negative/positive on 12v plug?

Question:
Hi,
I was just wondering if someone could tell me which part is negative and which part is positive on a 12v plug. Am i correct in thinking the end is positive and the sides are negative? Thanks for the help.

Answers:

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If you are referring to a power supply plug for the lighter,yes the center contact button(spring loaded) is + and the side contacts are -

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Are there any cars that...?

i own a shop,and the very end on any adapter is going to be the positive part of it and the sides will be the negative ,or the ground as we call them,good luck.

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White painted rectangles (about 2'x1') on dual carriage/motorways. What do they signify?

Yes, you are correct, the middle connector is the positive and the sides on the connector are the neagatives. On the wires themselves, there will be a colored stripe on the positive wire.

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