Need help on wiring on LED taillight

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Lukewang01

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Jul 27, 2019
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I'm working on an experiment to retrofit XLT with LED tail module. I came across a red wire that I couldn't get anything to light up when I apply 10v across it. Does anyone have any idea on what function does this wire has? I know on halogen tail module it controls the HI state of break light.

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