Product Code:SAE J2191
Title:Recommended Practice for Identification of Standardized Truck and Tractor Electrical Circuits
Issuing Committee:Truck And Bus Electrical Systems Committee
Scope:This SAE Recommended Practice defines a recommended practice for implementing circuit identification for the circuits of the power and signal distribution systems of the Class 8 trucks and tractors. This document provides a description of a supplemental ciruit identifier that shall be utilized in conjunction with the original equipment manufacturer's primary ciruit 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 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.