I know the newer Ram IBC senses the trailer being connected and doesn't send out any power to the brakes if it's disconnected so that could be why you aren't reading any voltage at the connector, assuming that's where you're making the measurement. As I recall my 2011 was the same, but I can't specifically remember if that's the case or not. If your trailer is new, it takes quite a few brake applications to break in the brakes. Recommended procedure should be in the instructions for the axles. Voltage should be a full 12vdc with the slider at full braking and the controller set to 10. If you have a clamp on meter that works on DC you can check the current, which should be approximately 3 amps per brake drum on the larger brakes.