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Electrical Problem 940 Volvo

My 1994 940 Volvo sedan is blowing the fuse on the circuit that includes the radio, antenna motor, dome light, clock, and open door buzzer. When the fuse blows, the buzzer stays on continuously even when I am driving the car. If I replace the fuse, the circuit is okay for a few days until the fuse blows again. Any ideas what may be causing the fuse to blow?