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Yepper, the center of the cig lighter plug is +.
Its NOT unusual to have a screw in tip with a built in fuse in there. Some of the cheaper plugs use only one side as the negative, but both sides of yours are working (-)
Its NOT unusual to have a screw in tip with a built in fuse in there. Some of the cheaper plugs use only one side as the negative, but both sides of yours are working (-)