The test light is just a simple power test. Clip on to any ground source (battery negative terminal) and then touch the probe to a positive source and the light will come on if you have power.
Touching the probe to the positive of the light socket would light up if you had power beyond the switch.
The probe can also pierce the insulation on the wire to determine if current is flowing.
In the 80's, I worked five summers at Shep Browns and only needed a test light for the majority of electrical problems.
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