I bought a new 08 WR 450 and have ridden it all season. Until yesterday, I had never paid any attention to the tail light. What is the normal operation of the tail light? Mine is on when the power is switched on (main power switch on trip computer). Conversely, my headlight only operates while the engine is running. There is no apparent 'brake light' function, but this appears normal from some reading of other posts that I have done. I can't find this information in my owners manual. Can somebody please tell me how the tail light is supposed to operate? and if it is not correct point me to a possible cause?