I want the wire to go to the brake light wire, so the brake lights flash like you previously stated.
Copy and paste the next line, this is what the instructions look like, ignore the text, i sent this to my brother to try to help me.
http://www.geocities.com/operatic98/gram/pat16.jpg
i'm not sure if that'll help, i just thought it'd be good for you to see what i'm sort of dealing with. I'm no wireing master, i sort of did this without a clue in the world. But hey, at least the alarm works great! i just want the brake lights to flash so i feel complete =)