I am thinking of buying one of the car vacuum cleaners, which can be plugged into the cigarette lighter socket in the car. I would like to know whether this will affect the car battery. Where is the power for this socket coming from? Is it taking directly from the car battery, or if the ignition is on, will it take from the gasoline power?
The battery if the engine is not running, and from the alternator if the engine is running.
Works the same as the headlights or the radio. Don’t worry, it’s not much of a current draw unless your battery is shot or your alternator is defective.