Re: Connecting cigarette lighter to 12v ignition
Nearly always do I take the high road but since you said, "a super easy way", maybe install a relay at the lighter and wire the coil into something like the stereo. Depending on which of the two common relays you pick from, the coil draw is 250mA, max; not a concern on the deck circuit and while in there, add the least length possible to the cig lighter wire.
Alternatively, you could see use an ammeter on the usb adapter and see if there is any meaningful draw when it's plugged in but not in use.
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