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It is a ground problem. When you turn on your headlights, they are sharing the same ground that your brake and T/S lights are using. Check all ground connections to the body from all headlight and taillight wiring are connected and tight. If it doesn't affect your taillights, it may be in your T/S switch. Check your ground connections first.
If you are not getting power from the headlight switch for that circuit, but the other side works, you'll have to trace the wiring. The socket has two wires plus a ground. One wire is for the tail lamp circuit and the other is for brake-turn signal.