This document provides information and instructions for troubleshooting vehicle electrical systems. It begins with an introduction that defines various symbols used in schematic diagrams, such as wire colors, connectors, components, and general troubleshooting procedures. The introduction also describes how to interpret schematic diagrams and locate components. Schematic diagrams are organized by system and include circuits, connector configurations, and component locations. The document provides symbols for components, grounds, splices, connectors and general electrical symbols. It concludes with instructions for a five-step troubleshooting procedure and notes on using appropriate troubleshooting equipment.