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To begin toning out a wire, connect each tone generator lead to a different conductor of the “target” wire to be toned out. Briefly switch the generator to the “Continuity” function, to make sure there is no short (light stays off), then proceed with toning. All tone generators convert electrical signals into an audible compression wave in virtually the same way that your home stereo system accomplishes the same task. The electronic signals pass through a coil that produces a magnetic field when it receives a current.