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I just bought a used H-D LED lights, (1) 7" headlight and (2) 4.5" running lights on eBay. On the headlight I know what the black, white and yellow wires are but not what I'm call gray at this time. Also I'm not familiar with the wire colors, gray and white on the running lights. Can you one of you more knowledgeable Harley guys please enlighten me?