RP 186 - Wire And Cable Repair Guidelines: Introduction

The primary cable used on a heavy-duty truck, tractor, or trailer electrical system is the medium through which all power and signal is transmitted to the vehicle's electrical components. As such, special attention must be paid to proper cable construction and selection when electrical wiring repair is required.

TMC RP 166, Low-Voltage Primary Electrical Cable Specification for Heavy-Duty Electrical Repair, is recommended for use when wire repair is required. It will define the terminology and specifications needed for low-voltage primary cable identification and selection.

SAE International (SAE) J1128, "Low-Voltage Primary Cable" - Type GXL and SXL cable, is a good overall choice to cover most wire repair service needs.