[Racing Rice]

Sounds like a fuse to me.. That would explain the fast blinking too. To much power, if its not the fuse check the relay (flasher, I guess newer cars still have those, though Ive never had to replace one on a newer car.)

You may want to look around though. It almost sounds like you have a short or something somewhere. I would check the wires from the old blinkers and make sure they are still connected taped up well.