I am having a problem with my boat trailer lights. The directionals work as well as the brake lights, but when I turn on my headlights, nothing works. I've rewired my boat trailer and ran separate grounds to each light, no help. It's a factory installed tow package with a 4-flat connector. The trailer harness I used has 5 wires- 1 ground, 2 directionals and 2 tail. Any suggestions?