Gm Wiring Harness Color Codes

By | January 25, 2023

GM Wiring Harness Color Codes

GM wiring harness color codes are used to identify the different wires in a vehicle's electrical system. Each wire is assigned a specific color, and this color code can be used to trace the wire back to its source. This can be helpful for troubleshooting electrical problems, or for replacing a damaged wire. The following is a list of the most common GM wiring harness color codes: *

Black:

Ground *

Blue:

Power *

Brown:

Battery positive *

Green:

Ignition switch *

Orange:

Alternator *

Pink:

Starter *

Purple:

Headlights *

Red:

Brakes *

White:

Horn *

Yellow:

Turn signals It is important to note that these are just the most common GM wiring harness color codes. There may be other colors used in specific applications. If you are not sure what a particular color code means, it is best to consult your vehicle's owner's manual. ## How to Read GM Wiring Harness Color Codes GM wiring harness color codes are typically printed on the harness itself, near the connector. The codes are usually printed in a two-digit format, with the first digit representing the wire's function and the second digit representing its polarity. For example, a wire with the code "12" would be a positive battery wire, while a wire with the code "21" would be a negative battery wire. In some cases, the color codes may be printed on a separate label that is attached to the harness. The label will typically have the same format as the codes printed on the harness itself. ## Troubleshooting GM Wiring Harness Problems If you are having problems with your vehicle's electrical system, one of the first things you should do is check the wiring harness. A damaged or incorrectly wired harness can cause a variety of problems, including: * Lights that don't work * Engine problems * Electrical shorts * Power surges To troubleshoot a GM wiring harness problem, you will need to: 1. Identify the problem. What is not working properly? 2. Locate the wiring harness that is associated with the problem. 3. Check the wiring harness for damage. Look for broken wires, loose connections, or corrosion. 4. Repair any damage that you find. 5. Test the system to make sure that the problem is fixed. If you are not comfortable working with electrical systems, it is best to have a qualified technician troubleshoot the problem for you. ## Conclusion GM wiring harness color codes are an important part of the vehicle's electrical system. By understanding these codes, you can troubleshoot electrical problems and make repairs yourself. If you are not comfortable working with electrical systems, it is best to have a qualified technician troubleshoot the problem for you.


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