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If you look up power probe, there are Chinese copies available on wish/aliexpress that should do the job. They're incredibly useful for figuring out wiring, because they work a bit like a test light (except with a number for the voltage, instead of just the light), but you can also send power and ground to a circuit (I think up to 10a) to test it, when the time comes. I'd say get a real one, but they're like $180aud.
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