This is on my 09 Street Glide. On my way home today I noticed my left turn signal flashing fast. When I got home I checked an the bulbs were working right. I still replaced all 4 bulbs ( left and right sides ) with new ones, and still have the fast flashing on the left side. The old bulbs had the grease on them an did not look corroded. Is there a relay that could go bad? Anyone have any idea where to start?