Shut my truck off recently and the ABS continued humming with truck off. Had to remove the fuse to stop it. Brake and ABS lights both on. TRuck can be off, and as soon as I reinstall the fuse, it begins humming again. It is the part that resembles an electric motor or starter housing that is running. I have lightly tapped it with no change. Any ideas. I have not replaced the rear wheel sensor since everyone that had that problem didn't mention the ABS continuously running. Any help would be appreciated. 

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