Try this....
http://www.zggtr.org/index.php?topic=2505.msg28530#msg28530Note that I found it using the search box. Typed in 'brake light', deselected all the boards except C14 Accessory, and hit search. Found it linked to another thread in the second hit.
Hopefully that gives you what you need. Plenty of threads came up on that subject so if that doesn't fit the bill there are others.
From that post:
Bike Function Admore
Red Tail light Red and Blue
Blue Brake Purple
Black Ground Black
Green Right turn Green
Green Left turn Yellow
In further interpreting your post, it may be that you only need to know what the red/black wires on the accessory itself do. If so, typically red is hot and black is ground. Your accessory should have instructions, if not, you need to contact the manufacturer. But if it was mine, I would assume the standard convention.
