Installing an aftermarket car stereo is one of the most common vehicle upgrades. Whether you are adding Bluetooth, a better amplifier, or a touchscreen head unit, understanding the wiring is the key to a clean, reliable installation. This guide covers the standard car stereo wire colors, wiring diagrams for common scenarios, and step-by-step installation instructions. Car Stereo Wire Color Code The aftermarket car stereo industry uses a standardized wire color code. Most head units from Pioneer, Kenwood, Sony, Alpine, and JVC follow this convention: Power and Ground Wire Color Function Description Yellow Battery (constant 12V) Always-hot connection from the battery. Keeps memory settings when the car is off. Red Accessory (switched 12V) Provides power only when the ignition is in the ACC or ON position. Turns the stereo on/off with the ignition. Black Ground Connect to a clean, bare metal point on the vehicle chassis.…