2004 Disco. I'm about to leave for Vegas in the morning and I'm trying to figure out my trailer lights. They don't work. Weirdest part about it is that my brake lights only come on (rover and trailer regardless of whether trailer is hooked up) only illuminate every other time that the brakes are hit. Also, trailer lights don't really work either, but that's probably related to this weird issue. Anybody got a clue?!