I had the same issue a few months back and it wind up being the sockets. Make sure you are making good connections on both the front and rear blinkers, if either one of those loses continuity it'll blink rapidly like that. I removed the bulbs and bend up the little levers inside the sockets and also bend inward the socket walls for better connection, also apply some of that bulb grease they sell at the local parts store to keep moisture out. good luck manYes Bulbs are fine, I was maybe thinking there is a relay bad or going bad. yesterday it worked normal for a min then acted up again..