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I just rechecked mine, here is what I see:
Polarity is important, of course on the sled that should be a given.
Contrary to the labeling;
White is the ground / common
Red is the brake light hot lead
Black is the tail or running light hot lead
There is no guarantee that they are all wired like mine, as it is likely an imported product.
It is easy enough to figure out, with a minute or two and a battery.
Hope this helps!