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Automobile accessory power can be transferred by several different means. However, it is always ultimately derived from the automobile's internal combustion engine, battery, or other "prime mover" source of energy.
The 12V socket, also known variously as a car cigarette lighter or 12V auxiliary power outlet, is the primary method by which power is delivered to portable electronics in cars, trucks, recreational vehicles, boats, and in a handful of other contexts.
The accessory wire is what triggers the stereo to turn on when your ignition key is in the "accessory" position
Getting into “accessory mode” is pretty straightforward. Simply turn your key clockwise until you land on the marked position. Keep in mind, you need to turn it much less than you typically do to start the car. If you can hear your engine running, then you're not in accessory mode.
You can run as many accessories as you want off one circuit as long as the total current of all those items isn't more than the fuse for the circuit.
The 12V accessory wire is connected from the stereo to the ignition switch accessory wires. So when you turn on the ignition, it activates the 12V accessory wire to turn on the stereo. This means that the 12V wire must stay connected to power the stereo
Just connect this converter to your existing 12V AC low voltage transformer system, to power up the 12V DC products in your yard, do not need run 120V AC line to your yard.
So, for all who were also wondering: The accessory mode will time out after some time only in the "park" mode. Otherwise it will stay active until the battery is drained.
A new and fully car battery can stay for around two weeks without needing to be recharged from a generator. This battery will fully get discharged after approximately two to three months. If you leave the battery for roughly two and a half months, you will not be able to start the car engine.
It happens all the time in my 2017 model. It means you have full power for all accessories, the USB and power outlets, without starting the car. Yes, if you want to disable it, to save the battery from draining while sitting in the car without starting it, you simply press the start button again.
ACC (red), supplies +12V power to car audio and other accessories, only when the car's ignition is switched on. Constant (yellow), also called BAT or Battery, provides permanent +12V power from battery. This allows the radio to retain settings (for example stored radio stations) when the ignition is switched off.