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Ultra 30 powered rugged case wire identification help

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  • Ultra 30 powered rugged case wire identification help

    I just bought the rugged weatherproof case that powers the VIRB ultra. I do not need the long cable or the transformer. I intend to solder a male usb end to the cable after I cut it to length about 18”. I have a USB port pretty close to where the camera will be mounted on my motorcycle. My question is the round wire leading to the camera has two conductors. There is a center core with a white insulator and the other stranded conductor is wrapped around the core. Best guess on which is the positive and which is the negative?
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