How to connect power supply in the car?

  • 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 the battery. This allows the radio to retain settings (for example stored radio stations) when the ignition is switched off.
  • Ground, abbrev. as GND (black), 0V, usually connected to the vehicle’s metal chassis and body.

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