I have a drawtite activator II (part number 5500) and it can be set from 0-10 with the LED thing and it works by ramping up the brakes to that level. So when I hit the brake pedal, it ramps up to 8 if it is set there. Well lately it ramps up and eventually overloads ("ol" on the screen) while it is still ramping and then it just starts at 0 again. You can feel the trailer start to drag as it ramps then it lets off, does this over and over always overloading. Just recently started doing that crap. If I turn the level down to 5 or so, it doesn't overload.