So after my fried ground wire I had I bought a kit to rewire my trailer. Four wire harness and "submersible" tail lights. I spliced for my fender lights red/amber. Those work fine. My center light in the middle of the trailer works fine. My tail lights not so much. Break lights work. Blinkers work but when I push the brakes they stop flashing. They also don't light up when the trucks running lights are turned on, but the fender running lights work. Any ideas? There is no ground wire coming out of the tail lights. Do I need to add one on each light? Help!