One problem related to tail light switch has been reported for the 2006 Dodge Ram 1500. The most recently reported issues are listed below.
The tail light function of the trailer wiring harness stopped functioning. Still have use of brake and turn lights. This is hard to catch on a visual test since I usually check turn and brake functions. Towed for weeks before I was told of the malfunction. Therefore cannot see trailer at night. Dealership could not fix problem.