- Black: Ground
- Red: Accessory power
- Yellow: Constant power
- Blue: Antenna power
- Orange: Dimmer power
- Green: Left front speaker output
- Purple: Left rear speaker output
- Gray: Right front speaker output
- Brown: Right rear speaker output
In addition to these wires, some Silverado models may also have a separate wire for the steering wheel audio controls. This wire is typically colored purple/white.
To install a new radio in your 2005 Silverado 2500, you will need to connect the corresponding wires from the radio to the wires on the vehicle's wiring harness. It is important to match the wire colors correctly, as connecting them incorrectly could damage the radio or the vehicle's electrical system. You may need to use a wiring diagram for your specific model year and trim level to identify the correct wire connections.
Once you have connected the wires correctly, you can install the new radio in the dash of your Silverado 2500 and enjoy your new sound system!