In need of immediate help. Am trying to wire a spoiler for my sons 850. It has two black wires coming out of the spoiler for the brake light. The brake light has the following: 2 light purple/white stripe wires, 1 black wire, 1 smaller guage black wire, 2 light blue wires, 1 light green wire, 1 yellow/brown stripe wire, 1 red/white stripe wire and 1 green/yellow stripe wire. I need to know which wire is the brake light wire so I can graft on to that wire so the brake light in the spoiler works.

 

I just looked on the R under the grey panel on the trunk lid is a yellow plug that is the plug for the brake light.
There should be 2 wires from the spoiler that will plug into the yellow one.
Thats also how the spoiler in the garage is.

 

Thanks Tech. I ended up going to Autozone to get some of the little do dads that you use to crimp two wires together to graft onto an existing wire. The guy at AZ said that I would need a wiring diagram but then said if I had a multi tester I might be able to trace which wire it was. The light bulb then went on over my head. Hey I've got oneo of those at home. Pulled the tail light connector out of the assembly and plugged the black probe into one of the black wires for ground and then had the boy put his foot on the brake and I used the red probe and found the correct wire (Brown/Yellow stripe by the way). Crimped the wires together, used the brackets I bought off ebay and some 3M double sided tape and put that sucker on. Brake light works and everything. I almost pulled a muscle patting myself on the back.

 

Glad you got it.