Maybe this will save someone here some trouble. I have an A.R.E contractor cap on the truck and have never been able to get the third brake light to work without it flashing when a turn signal was turned on. I finally called a different dealer and the Tech knew exactly what I needed to know. In the main harness that feeds the tail of the truck, drivers side by the spare tire, there is a wire with a tag labeled "CHMSL" that is either white/orange or white/tan.
Maybe this will save someone here some trouble. I have an A.R.E contractor cap on the truck and have never been able to get the third brake light to work without it flashing when a turn signal was turned on. I finally called a different dealer and the Tech knew exactly what I needed to know. In the main harness that feeds the tail of the truck, drivers side by the spare tire, there is a wire with a tag labeled "CHMSL" that is either white/orange or white/tan.