What are the stereo wiring colors for Alfa Romeo 156?

In the Alfa Romeo 156, the standard stereo wiring colors typically include the following: the power wires are usually red for ignition and yellow for constant power, while the ground wire is often black. Speaker wires can vary, but common colors are white and gray for the front speakers, and green and purple for the rear speakers. Always refer to a wiring diagram specific to the model year for the most accurate information, as variations may exist.