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Not enough info. The only "12 volt outlet" that is remotely standard is the lighter socket in a car. Most if not all cars have the negative side of the battery at ground, which is the outer shell of a lighter socket. So the center contact is positive. If you are asking about any other 12 volt outlet, you need to check it out with a meter, or get a diagram for the system.
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Earn +20 ptsQ: What side of a 12v power outlet is positive?
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