RedRyder
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There are two wires from the 3rd brakelight, white and black, right? And there are two for your spoiler light, red and black? White and red should be power, so you could splice those together. Then splice together the two blacks, which are ground.
I wired a highmount led brakelight inside the rear window, and that's basically what I did.
I wired a highmount led brakelight inside the rear window, and that's basically what I did.