What would you use to detect shorted coils within a motor's armature?

To detect shorted coils within a motor's armature, the most effective tool is a growler. A growler generates a magnetic field and is specifically used to test the integrity of windings in motors. When placed over the armature, it induces a magnetic field, which allows you to observe the condition of the coils. If there are shorted coils, the growler typically produces a sound or vibration indicating the presence of a short circuit.

While a multimeter can measure resistance and help identify open or short circuits, it may not provide the same level of diagnostic insight directly related to motor windings. An oscilloscope is more suited for observing waveforms and electrical signals rather than testing for shorts in motor windings. A voltage tester simply checks for the presence of voltage, which does not provide the information needed to assess the condition of the armature's coils. Therefore, a growler is specifically designed for this type of diagnostic testing, making it the most appropriate choice.