本SAE文件定义了为8级载重汽车和拖拉机的电力和信号分配系统实施电路识别的推荐实施规程。本文件提供了补充电路标识符的说明，该标识符应与线束中使用的原始设备制造商的主电路标识结合使用，但不包括带有尾纤的电气或电子设备。补充电路标识符与第5节中确定的电源和信号分配系统的指定子系统交叉引用。

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 inSection 5.