I see you have asked this a few days ago. I don't like to let any Dodges sit, but this is a tough one. Without starting to trace wires to see if there is an open circuit, there isn't much you can do. Other than that, I have to ask if you checked the brake light switch itself. If I recall, power goes through the switch for the brake lights to work, and it sends power to the signal switch.
Let me know if you have had any luck at this point. If you haven't, I will try reading through schematics to see if I can find anything that can be causing the problem.
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Friday, April 4th, 2014 AT 7:00 PM