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Let me preface this by saying I'm an utter newbie and it took me hours of reading to just figure out what questions to even ask the seller.
Anyway, he said that the power supply was regulated with a timed auto-off and that I could simply take the 12V straight from the ignition.
I'm going to keep my headunit though, so if I'm pretty sure the smartest thing to do would be to run a wire from the battery and set up a relay.
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