These modern(?) brake controllers use an accelerometer (a pendulum device)
 to energize the trailer brakes in conjunction with the tow vehicle brake
 light switch.
  
 So, if your brake light to brake controller lead is not connected properly
 (the most likely cause of your problem) the controller won't energize the
 trailer brakes. In addition, if there is no slowing down of the tow vehicle
 (no accelerometer input - testing while parked) you are not going to get
 much braking current to the trailer brakes either. 
  
 Note that manually actuating the controller bypasses both of the above
 inputs.
  
 Oliver Filippi
 
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