1990 Ford E-150 Q&A

1990 Ford E-150 Question: brake lights only work when the headlights are on what would cause that?

I'M trying to figure how to diagnose the reason why the brake lights on a ford econoline only work when the headlights are on. Could it be a short to power? I'm not sure where to start could someone give me any good advice? Its a 1984 by the way thanks. -
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