Need tail light help!

[The Big Green]

My left brake light and turn signal aren't working, so I bought the board behind the lamp held on with the 2 screws and it didn't work. I finally decided to test it and the only wire that works is the brown one(tail light). Where are these coming from, down the frame from under the door? I'm asking because I'm going to the track tomorrow at 11ish and still have to wire a plug for trailer lights and I'm bagged and bodied so getting under it takes skill lol and I'm pressed for time as it is. Any help will be great, I heard the part I bought goes bad a lot so I started there but after that didn't work I guess I have a broke wire. Anybody care to name the wire colors and what they do? Yellow, brown, green, black, blacks ground of course, which color is the left tail and brake light that's not getting hot?
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