BRAKE LIGHTS REMAIN LIT WHEN HEADLIGHTS ARE ON

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Brake lights (all three) light up when parking and driving lights are on: Facts/trouble shooting efforts: -With lights on, brake lights are lit -With lights on, depressing brake pedal slightly increases intendsity of lights -With lights off, dashboard lights light up when brakes are depressed -With lights off (and tail light bulbs physically removed from sockets) dashboard lights light up -With lights on and NR 2 fuse removed (brake switch), brake lights remain on Believe I have ruled out brake switch and bulbs as causes of the symptoms. I know the dash board lighting up when I hit the brakes is the clue but can't figure out why.