SH413 Wiring Harness Same as GM-1343M / Metra 71-1858-1

General Features: Factory Reverse Wiring Harness Compatible with select 1987-2005 GM Vehicles 21-pin Plug plugs into OEM Radio Power and 4 speakers Plugs into car harness at radio Heat resistant turbowire for lasting a lifetime Allows installation of aftermarket radio using factory wiring and connector High quality, ABS plastic molded connector for the perfect fit Pre-stripped to make installation quick and easy No cutting of factory wiring needed Same as Metra 78-1858-1 Connection guide: Yellow – 12V Constant Red – 12V Accessory Black - Ground Orange – Dash Light Dimmer/Illumination Green – Lt Rear Speaker (+) Green with Black Stripe Lt Rear Speaker (-) White – Lt Front Speaker (+) White with Black Stripe – Lt Front Speaker (-) Purple – Rt Rear Speaker (+) Purple with Black Stripe – Rt Rear Speaker (-) Gray – Rt Front Speaker (+) Gray with Black Stripe – Rt Front Speaker (-) Compatibility list: BUICK: 1988 - 96 Century 1988 - 90 Electra 1992 - 94 Le Sabre 1988 - 94 Park Avenue