The following wire harness applies for General Motors Radio. Herein you will find detail information about the color diagram of GM radio wire harness e.g. Pin A for right rear speaker has a light blue color for typical GM factory in Dash Wire Color while it is purple with black stripe for typical new radio equivalent wire color. Another example, Pin B for left rear speaker is yellow for typical GM factory in Dash Wire Color, while it is green with black stripe for typical new radio equivalent wire color. (Source: installdr.com)
Find more information about General Motors Radio Wire Harness (Color Diagram) here.
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