Ok, so my 99 has the factory tow package and trailer hookup. As every trailer I've used has the regular 4-pin hookup I got the uhaul adapter plug it in. Went to use it today and it just isn't working right. With the headlights off the brake lights work, the left turn works and the right signal flashes both sides. When I turn the headlights on they don't light up at all, even when I step on the breaks or use the turn signals. Help?