Both lights are lit up when I have the headlights on. When I hit the brakes, the left tail light shuts off and the right one doesn't do anything. My left turn signal works fine, but my right turn signal does nothing. No matter what I do, the right taillight is always on, but break lights and and turn signal are not working. I just installed new trailer lights and they have a good connection to the wiring harness. Could it be that I need a new wiring harness or a new plug that hooks into my trucks wiring?