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Old 11-09-2005, 11:53 AM
autozen autozen is offline
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
The larger diameter post is the positive. Look at every car battery and you'll notice the posts are two sizes. Also look at any zip cord in your house.You know the extension cord your lamp is plugged into. One side of the cord is smooth, and the other side is rough to the touch. The smooth side is positive and should correspond with the black wire in the wall for safety.
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