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What's the easiest way to get 5V to a USB under the hood of a 2009 Civic (or preferrably, a general solution)? Basically, I want to put a custom theft-prevention device either underneath the dash or somewhere inside the engine bay, and I need a stable source of 5V (only when the car is running is fine) without messing with the wiring too much.

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I'd suggest picking up a feed from a wire which is live only when the ignition is on and hard wiring something like this product into the loom.

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