The signal wire and the power wire on the camera are the same thing - they are connected in the camera. Just remove the signal wire going to the reverse lamp (you don't need it) and you'll be good to go. Other than locating a new source of power for the camera that is - if you connect the camera directly to the battery, it will run constantly and could (after a week or two) flatten the battery. You'll want to find a source of power that is switched with the ignition, or has been suggested, use the reverse lamp power to trigger a relay to supply battery power to the camera.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)