I have four wire flat connector on Dodge Grand Caravan pulling an older Viking popup camper. One wire controls running lights, one each for left and right turn signals and one for ground. Since TV (tow vehicle) has brake lights separate from turn signals how do I get camper brake lights to work? Seems like I've heard of some device that makes this work, though I'm contemplating installation of a separate pair of amber lamps for turn signals while wiring the brake lights separately. I'd just rewire the turn signals to the amber lamps and add a single wire with a "tee" conector to feed both brake lights. Last couple of camping trips I didn't even notice I had no brake lights until I'd gotten home! Then I had to use a U-haul rental trailer in March and had same problem. Duh! This used to be a problem especially with foreign cars as tow vehicles since they typically were wired with separate bulbs for turn signals and brake lights.