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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I think David means the tail light strip. I know other people have had this problem with the "light out" and in the past I have had it come on and a few days later another bulbwent out. But before you go get a new tail light strip, make sure the blubs are pluged in all the way and make sure your signal, brake, and back up lights are working. Just my $.02.
I had the same issue on my 03 - it was the upper bulb in the rear light. After changing it 2 times, the dealer noted that possibly the strip was shorting somewhere. They replaced it and I have not had any issues since then.