[Ron61]

I agree with StrictlyPersonal that the flasher could be getting bad and the vibration is causing it to make and break momentarily. However I did have a similar experience once and it turned out that in running the power lead multiples to my gages, one of them was touching the back of the turn signal light and it had worn just enough insulation off by rubbing on the terminal that it would make it blink once in a while. I had unplugged the flasher and it kept happening so I knew it had to be something up behind everything naturally. I just moved that power lead off the terminal and taped the tiny spot it had worn through and never had a problem after that. Hope yours is as simple.

Ron