Tail lights ford van?
my answer is try to check it out on auto repair shop maybe there other problem...
Tail lights ford van?
Fuse will be labeled as parking lamps or tail lights. I doubt it's a bad ground. Check the fuse first.
One other thing it could be: If anyone has added a pigtail for trailer lights, those wires that have been spliced can sometimes come unhooked or just have a lousy connection due to corrosion from the elements. If you have a trailer harness on the back, you may want to follow those wires to where they were spiced and see if they need re-connecting. Waterproof connectors and some good electrical tape might be in order too!