Car Wiring Numbers

By | August 5, 2022



The intricate web of wires and connectors that make up a car’s wiring system is both essential and complex. Understanding how to identify each individual element of the wiring system is key to troubleshooting any electrical problem, so having a basic knowledge of car wiring numbers can be invaluable.

Car wiring numbers are codes assigned to each individual wire and connector in the vehicle. Knowing these numbers helps to quickly identify which wires and connectors are meant to be connected to each component, allowing automotive technicians to diagnose and repair electrical issues quickly and efficiently. The numbering system is standardized across the car industry, meaning that even if you switch between brands, the same code will be applied for the same types of wires and connectors.

To read and understand car wiring numbers, start by looking at the letter at the beginning of the code. This first letter identifies the type of wire or connector. An ‘S’, for example, means that it is a signal wire, while a ‘G’ indicates it is a grounding wire. The following two numbers identify the wire size and amperage rating, respectively. The last two numbers indicate the connector type. Knowing all these details can help technicians avoid common wiring issues, such as incorrect connections and compatibility issues. Having a solid understanding of car wiring numbers can save time and money when it comes to diagnosing and repairing a vehicle’s electrical system.


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