I have a strange problem with the right turn signal on my bike. It works fine below 10 mph and above 50 mph, but in between, it either doesn't work at all, or only comes on very briefly. I have checked the wiring harness going to the TSM ( did the voltage tests listed in the repair manual) and it all seems to be ok. I have also checked the bulbs, and they are ok. Any suggestions on what else to check would be greatly appreciated. I sure hope that I don't have to replace the TSM... my wallet is light enough already!

 

really weird and i have no ideas...
but i am posting this to move your post back up in case we have some harley mechanics lurking-

 

Just a long shot,check the wiring that runs under the seat and crosses over the frame,maybe at those speeds your ridding position is such that you are pinching wires.Good luck.