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I have a 05 c6...
when i use my right blinker...sometimes it works perfect....and sometimes it blinks really fast...when i get out i see...the front right blinker isn't working....so i was wondering okay the bulb is gone...but when i shut it off and turn it back on...the bulb starts working.....
I am going to guess you have a corroded connection between the bulb and socket. The last several bulbs I had go bad were due to this and not a burned filament. When you get the new bulb you can buy some “connection grease” to keep this from happening again.