This SAE document defines a recommended practice for implementing circuit identification for electrical power and signal distribution systems of the Class 8 trucks and tractors. This document provides a description of a supplemental circuit identifier that shall be utilized in conjunction with the original equipment manufacturer's primary circuit identification as used in wire harnesses but does not include electrical or electronic devices which have pigtails. The supplemental circuit identifier is cross-referenced to a specified subsystem of the power and signal distribution system identified in Section 5. This document will provide a common method of identifying circuit function for commercially available Class 8 vehicles. It will guide the service technician in diagnosing vehicle electrical subsystems. The identification method will supplement component OEM circuit identification for each major subsystem.
SAE J2191-2010 history
2023SAE J2191-2023 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
2019SAE J2191-2019 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
2014SAE J2191-2014 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
2010SAE J2191-2010 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
2004SAE J2191-2004 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
2002SAE J2191-2002 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
1997SAE J2191-1997 Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits