I have a 2008 f-250 with the integrated brake controller and when i hook it up to my trailer it wont come on. When i manually slide the slider to activate the brakes it activates the brakes on the trailer. I checked the wiring all the way back to the brakes and everything is good so im not sure whats up with it. Just weird how if i manually engage the brakes it says "trailer disconnected" but still activates the brakes. Any ideas?