It sounds like you are not getting the signal from the brake switch on the red wire. Verify that the signal is present when stepping on the brake pedal. If you ARE getting the signal to the controller, I'd say the controller was bad. If you are NOT getting a signal, take a closer look at the connection to the brake switch on your brake pedal.
2008 2500HD LT CCLB/Ally. Line-X, B&W Companion, MaxLoader Springs, Edge Insight CTS, Kennedy Custom ECM
2009 Arctic Fox 5er, Silver Fox Edition 29-5T, 3.6 Onan LPG, SteadyFast Stabilizers