My 2003 buick century right turn signal flashes fast but only in the front. I was told that this is the sign that a bulb is burnt out, which it was. The right rear bulb was burnt out so I replaced it and I still have the same problem. The hazard flasher does not work on that socket or the turn signal. But the brake works and the running light works in that socket. What could possibly be the problem. Thanks for your help.