At your lower brake lamps, did you check for voltage? With the brake switch activated, the white wire with tan tracer is voltage for lower brake lamps. In the diagram, see the splice bs01, you know you have voltage to that point because one of the legs off that splice goes to the high-mount brake lite.
The info I looked at was without trailer lamps.
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Saturday, November 18th, 2017 AT 8:03 PM