I have 2007 ford f150, I was pulling a boat and noticed the tail lights, and running lights on the the trailer were not working. If I hit my brakes the tail lights would would light up, but otherwise won't. I turned my hazard lights on and the tail lights work on the trailer. My tail lights on my truck work, but I can't think of what the problem could be. It is my neighbor's boat and when he uses his truck everything is working. Could it be a fuse? any ideas will help.