why are the tail lights on my 1985 Thunderbird not working and the brake lights and all of the lights do?
Wrong bulbs, blown fuse, cut/damaged wires, Headlight Switch - it will take some investigating.
Are the dash and front parking lamps working? If so, there is a chance it is the connector in the trunk, just outboard of the trunk hinge. It may well have come unplugged.
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