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My father has a 2003 Ram 2500/Cummings .He pulls a 5th wheel trailer a lot with it & gets a "lamp out" warning light with the trailer lights plugged in.Not all the time but quite often.The dealers have been no help so far.He said it will go out some times & when hits rough road it comes back on.Any body ahd this one before?
Thanks for your reply,grahmpus
My 03 has had the same problem, come to find out after about a month of the dinging the brake light bulb element was broken but making contact except when I hit a bump or when the bulb got hot. Might try changing the bulbs. work for me twice.