Reviewed by Shannon Martin, Licensed Insurance Agent.
The ACC wire for your car stereo is a 12-volt battery permanent wire.
The ACC wire connects to and powers your car stereo. It pulls power from your car battery when the radio is in use. However, it does not pull electric power when the radio is off, saving your battery from draining.
The ACC wire is just one of three power wires typically needed for a car stereo. The ACC wire turns your stereo on when your ignition key is in the accessory position.
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