When it comes to installing a new radio in your vehicle, it’s important to have a clear understanding of the wiring diagram. The 1999 GMC Suburban has a simple, yet effective, wiring system that allows for easy installation of a new radio, as long as you understand the wiring diagram. In this article, we will provide you with a clear and concise wiring diagram for a 1999 GMC Suburban, as well as frequently asked questions and additional tips for installation.
Wiring Diagram
Before getting started, it’s important to note that the wiring diagram may vary depending on the model of your Suburban. This wiring diagram is specifically designed for a 1999 GMC Suburban, but some wiring may differ depending on the specific model.
Here is a detailed wiring diagram for a 1999 GMC Suburban:
| Wire Color | Function | Connector |
|---|---|---|
| Orange | 12V Constant | Yellow (+) |
| Yellow | Switched 12V | Red (+) |
| Black | Ground | Black (-) |
| Gray | Front Right Speaker (+) | Light Blue (+) |
| Gray/Black | Front Right Speaker (-) | Dark Blue (-) |
| White | Front Left Speaker (+) | Tan (+) |
| White/Black | Front Left Speaker (-) | Gray (-) |
| Green | Rear Left Speaker (+) | Light Green (+) |
| Green/Black | Rear Left Speaker (-) | Dark Green (-) |
| Purple | Rear Right Speaker (+) | Violet (+) |
| Purple/Black | Rear Right Speaker (-) | Dk. Blue (-) |
Frequently Asked Questions
What is the function of the orange wire?
The orange wire is the 12V constant wire, which provides power to the radio at all times. This wire is connected to the yellow wire in the radio harness.
What is the function of the yellow wire?
The yellow wire is the switched 12V wire, which provides power to the radio when the key is in the accessory or run position. This wire is connected to the red wire in the radio harness.
What is the function of the black wire?
The black wire is the ground wire, which is connected to the negative terminal of the battery or a metal ground in the vehicle.
What is the function of the gray wire?
The gray wire is the front right speaker positive wire, which is connected to the light blue wire in the radio harness.
What is the function of the gray/black wire?
The gray/black wire is the front right speaker negative wire, which is connected to the dark blue wire in the radio harness.
Additional Tips for Installation
Before installing the new radio, make sure to disconnect the negative battery cable to avoid any electrical shock. It’s also important to use the correct wiring harness and adapter for your specific make and model of Suburban to ensure a secure and safe installation.
If you’re unsure about any of the wiring or installation process, it’s recommended to consult with a professional or seek guidance from the manufacturer of the radio.
By following this wiring diagram and additional tips, you can install a new radio in your 1999 GMC Suburban with ease.
