I have a 03 WR450f, the headlight dims when you rev it, blinkers only work when you rev it and horn sounds like it is underwater or doesn't sound at all. I was given a box with all the blinkers etc. inside when I bought the bike second hand. It has a brand new battery but is only running at 12.2 v at idle and max 12.5. Sometimes the starter motor clicks like the brushes are worn. Any ideas?