My lamp out is going off and on sporadically when driving my head lights are off , and all my lights are working , any ideas

 

Could it be a brake light bulb? Does it only come on when you hit the brakes? Could also be your circuit board for your tails. I think they had a problem shorting/melting a little. I'd check the tail light area. Have a friend hit the brakes for ya.

 

My 03 did this exact thing and that damn chime finally got on my nerves one day. I pulled the tail lights out and reseated all the bulbs and it stopped. So I guess even though they all worked one had come loose.