[Oldsguy]

If the tail lights are on when the headlamp/tail light/interior dimmer switch is in the off position you may have a bad switch. There should be no 12 volts available to the tail light socket at all with the switch in the off position (except when the brake pedal is depressed). For the lights to be on and get brighter with the brakes applied you would need both a bad brake switch AND some wrong lamps installed in the sockets.