The 1999 GMC Sierra is a classic American truck that has been a favorite of truck enthusiasts for decades. One of the most common modifications that people make to their Sierra is upgrading the stereo system. A new stereo can dramatically improve the sound quality of your music and add new features like Bluetooth connectivity and satellite radio.
However, installing a new stereo in your Sierra can be a challenge, especially if you don’t have a wiring diagram. In this article, we will provide you with everything you need to know about the 1999 GMC Sierra stereo wiring diagram. From the color codes of the wires to the connection points, we will cover it all.
Why do you need a wiring diagram?
A wiring diagram is a map of the electrical connections in your vehicle. It shows you which wires are connected to which components, how they are connected, and what color they are. Without a wiring diagram, it can be difficult to install a new stereo system. You may end up damaging your vehicle’s electrical system or connecting the wires incorrectly, which could lead to a fire or other serious problems.
By using a wiring diagram, you can avoid these risks and ensure that your new stereo system is installed correctly and safely. In addition, a wiring diagram can help you troubleshoot problems that may arise with your stereo system later on.
1999 GMC Sierra stereo wiring diagram
The stereo wiring diagram for the 1999 GMC Sierra is as follows:
| Wire Color | Function |
|---|---|
| Orange | 12V constant |
| Red | Accessory power |
| Yellow | Ignition power |
| Black | Ground |
| Light Green | Left front speaker positive |
| Dark Green | Left front speaker negative |
| Light Blue | Right front speaker positive |
| Dark Blue | Right front speaker negative |
| Grey | Left rear speaker positive |
| Black/White | Left rear speaker negative |
| Light Purple | Right rear speaker positive |
| Dark Purple | Right rear speaker negative |
It is important to note that some Sierra models may have slightly different wiring configurations. Before installing a new stereo system, you should consult a wiring diagram specific to your vehicle’s make and model.
FAQ
1. How do I know if my Sierra has a Bose system?
If your Sierra has a Bose sound system, you will see a small silver Bose logo on the speaker grills. In addition, the system will have a separate amplifier located under the center console or in the trunk.
2. Can I install a new stereo system myself?
Yes, you can install a new stereo system yourself. However, it is important to have a wiring diagram and the proper tools to ensure that the installation is done correctly and safely.
3. What tools do I need to install a new stereo system?
You will need a wire crimping tool, wire cutters, a wire stripper, and a screwdriver. In addition, you may need a mounting kit and a wiring harness adapter if you are installing an aftermarket stereo system.
4. Can I use the factory wiring to install my new stereo system?
You can use the factory wiring to install your new stereo system. However, it is important to note that the factory wiring may not be compatible with aftermarket stereo systems. In addition, the factory wiring may not be capable of handling the power requirements of a high-end stereo system.
5. How do I troubleshoot problems with my stereo system?
If you are experiencing problems with your stereo system, the first step is to check the wiring connections. Make sure that all of the wires are connected securely and that none of them are loose or damaged. If the wiring is okay, you may need to consult a professional for further troubleshooting.
