I'm trying to figure out what is happening to my trailer lights. When I hook up a trailer I have both blinkers. When I press on the brake all the lights turn on. When I have the brake pressed and turn on a blinker all the lights blink. I have no running lights. I tried two trailers and both trailers don't work. I bought the truck a while ago and have had the light problem since I bought it. I checked the fuses under the hood and by the drivers door and can't find any blown.