Metra 70-1856 Bypass Harness Allows you to connect an aftermarket car stereo to factory wiring in select 1990-96 GM vehicles with non-Bose® systems.

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Wire Code Chart: Wire Color    Function Black (thick gauge)    Antenna cable Red    +12 Volt Accessory Yellow    +12 Volt Constant Black    Ground Blue    Power Antenna/Amp Turn-On Orange/White    Dimmer White    Left Front Speaker + White/Black    Left Front Speaker - Gray    Right Front Speaker + Gray/Black    Right Front Speaker - Green    Left Rear Speaker + Green/Black    Left Rear Speaker - Violet    Right Rear Speaker + Violet/Black    Right Rear Speaker -