Under the dash

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I have a 2004 Chevrolet Silverado four-wheel-drive I turn the turn signal zone and mashed breaks both of them blank in the rear I turn my headlights on turn turn signal I'll hit the brakes they stop anyone help me with this it has the correct bulbs and brake lights were taillights work blinkers work but when I mash the brakes with the lights off both blinker is blinking at the same time when I have the lights turned on our mashed my turn signal and they quit blinking when I mastered bricksissue