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To wire a radio in a 1999 Audi A3, you will typically need to connect the power, ground, and speaker wires according to the color coding. The main power wire is usually red, the ground wire is black or brown, and speaker wires can vary by color (often gray, green, white, and purple). It's important to use a wiring harness specific to the vehicle to avoid cutting factory wires. Always consult a detailed wiring diagram specific to your model for precise connections.

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1w ago

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