Are you saying that the left and right turn signal indicators are always on about half brightness on the dash at the same time ? If this is the case and other lights on the back of the bike are acting strangely, then it is caused by the connections in the big grey plug (I'm guessing around 24 wires?) under the seat just to the right of the relays. It is in a black rubber boot between the relays and the frame on the right side (as you are sitting on the bike). I'm not sure which wire it is that is not making the good connection, but you should be able to make the problem appear and then go away by wiggling that plug. To fix it, I took a small screw driver and bent each prong slightly so it would make better contact, and the problem has never come back. I've had to do this on 2 different bikes.
Edit....I just re-read your post....numbers 1 and 2 are the dead giveaways. I would almost guarantee your problem is in the plug I described....the repair is free and easy to do. Let us know what you come up with....
ALSO.....IF I REMEMBER CORRECTLY,THE BIG GREY PLUG IS TO THE RIGHT OF THE RELAYS ON 06 AND NEWER BIKES, BUT AT THE VERY BACK OF THE SEAT WHERE THE FENDER MEETS THE FRONT, BOTTOM OF THE TRUNK ON 01-05 BIKES.