Gm Wiring Harness Color Codes

GM Wiring Harness Color Codes: A Comprehensive Guide

If you're working on a GM vehicle, it's important to have a good understanding of the wiring harness color codes. This will help you identify the different wires and connectors, and make it easier to troubleshoot any problems. In this guide, we'll provide a comprehensive overview of GM wiring harness color codes. We'll cover everything from the basics to the more advanced topics, so you'll be able to confidently work on any GM vehicle. ## Basics of GM Wiring Harness Color Codes GM wiring harnesses use a standard color-coding system to identify the different wires. This system is based on the following color codes: *

Black:

Ground *

Blue:

Ignition switch *

Brown:

Battery positive *

Green:

Body ground *

Orange:

Starter *

Pink:

Alternator *

Purple:

Headlights *

Red:

Brake lights *

White:

Turn signals *

Yellow:

Horn In addition to these basic colors, GM also uses a number of other colors to identify specific wires. For example, a wire with a black stripe might be a ground wire for a particular circuit, while a wire with a yellow stripe might be a turn signal wire. ## Advanced Topics in GM Wiring Harness Color Codes In addition to the basic color codes, GM also uses a number of advanced topics to identify wires. These topics include: *

Wire size:

The size of a wire is indicated by the number of stripes on the wire. A wire with one stripe is a 14-gauge wire, a wire with two stripes is a 12-gauge wire, and so on. *

Wire function:

The function of a wire is indicated by the letter or number that follows the color code. For example, a wire with a black stripe and the letter "A" might be a ground wire for the alternator. *

Wire location:

The location of a wire is indicated by the letter or number that precedes the color code. For example, a wire with the letter "T" and the color code "blue" might be a blue wire that runs to the starter. ## Using GM Wiring Harness Color Codes Once you understand the basics of GM wiring harness color codes, you can use them to troubleshoot problems or identify the correct wires for a particular modification. Here are a few tips for using GM wiring harness color codes: *

Always use a factory service manual or wiring diagram to identify the correct wires.

This will help you avoid making mistakes that could damage your vehicle. *

Be careful not to mix up wires with different colors or functions.

This could cause your vehicle to malfunction or even start a fire. *

If you're not sure what a particular wire does, don't touch it.

It's always better to be safe than sorry. By following these tips, you can safely and effectively use GM wiring harness color codes to work on your vehicle. ## Conclusion GM wiring harness color codes are an essential tool for anyone who works on GM vehicles. By understanding these codes, you can quickly and easily identify the different wires and connectors, and make it easier to troubleshoot any problems. Here are some additional resources that you may find helpful: * [GM Wiring Harness Color Codes](https://www.gmpartsdirect.com/wiring-harness-color-codes.html) * [GM Wiring Diagrams](https://www.autozone.com/repairguides/gm) * [GM Technical Service Bulletins](https://www.gm.com/content/dam/gm/brochures/tsb/tsbs/tsbs.pdf)

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