Originally Posted by chuck
what I'm seeing is the light rapidly blinking red, whenever the brake pedal is depressed.
Chuck, my Tekonsha user's guide says that a rapidly binking red light indicates a short. I had this problem after I relocated my controller, turned out I had run a screw into the wire going to the trailer brakes. Oops.
You could have a similar situation, check the main wire going to the trailer plug, and make sure you, or the person that wired it, didn't do what I did.