I hope someone can answer this one if I hit my brakes while my turn signal is on it makes my turn signal flash really fast when I let off of the brake it goes back to normal,also the upper cab brake lights blinks when turn signal is on.and if the headlights are on and I apply brake the turn signals flash really really slow I recenly removed rear bumper and left it off dont know if that does anything or not. could the headlight module be bad I have checked all bulbs and replaced all burned out ones..........Thanks