Why Exactly Car Charger Stop When Car Is Off

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Just out of curiosity, I'm wondering why car chargers can provide no power when the car is off in most cars. Is it because the electrical system that connects to the car chargers is running off the alternator and not the battery?

Best Answer

in most cars the cigarette lighter socket is on the accessory circuit and is only active when the key is in the accessory or run positions.

some cars have it always live.