I saw this film on TV around 1989.

I’m not sure if it was about Teenagers running away, or just on a miniature adventure.

It was set in the Countryside, and at one point they end up on a farm, overcast weather. One of the main characters was a girl with brown/black hair, and I think she wore a red wooly jumper for most of the movie. Unfortunately I never got to see the whole thing, so I don’t know how it ended. I wish I had more information to go on, I’ve been looking for this movie randomly on/off for a few years now.