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Message: <blockquote data-quote="torch" data-source="post: 1451189" data-attributes="member: 1295"></blockquote>Behind the battery. There's two fuseboxes there, I believe it is the right hand one, but could be wrong about which one. That sounds like a grounding issue. A bad ground forces power to seek an alternative path. Since the brake, tail and turn filaments all share a ground wire at the rear, the brake may be seeking ground by back-feeding through the tail and/or turn circuits to another ground point.  I would start by unplugging the rear lighting harness connector under the left hand side cover by the air box, remove all bulbs and test continuity through the harness and sockets. On my 06, I found one wire had broken internally right at the socket. The insulation was intact so a visual inspection did not reveal the problem, but the conductor inside was broken and had no electrical continuity. I was able to solder a short wire to the rear of the connector and splice that into the harness.[/QUOTE]