I'm back again. It was definitely an "Overload" message on my brakes. I have not had much luck finding a short in the wiring so I am back to give a little more information.
As was noted earlier I do have an exhaust brake so I don't rely on the truck and trailer brakes on descents. I have noticed that this problem gets worse or happens more with the amount of braking I do. If I have the P3 set on Power Boost 2 the warning will come on almost immediatley. If it is set on Power Boost 1 or off the power level has too come up to about 3 volts before the warning will happen. The more I am using the brakes as in stop and go traffic the more it will give the warning. I can definitely feel the trailer brakes ingage and then when the warning comes on I can feel the trailer brakes do away. It seems this is somehow related to a "heat" issue due to the fact that it happens with more brake pressure applied by the P3 or usage issue due to driving conditions this does not seem like a short in the wiring.Is this possibly a magnet problem? Is there a method to test the magnets with the trailer unhooked without the brake controller? If not what methods should I use to test the magnets?
Sorry for the lengthy questions. I am new to trailer brakes.