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Reading Wiring Diagrams

Diagram Symbol Language

Automotive wiring diagrams use standardized symbols to represent every electrical component. A zigzag line represents a resistor, a coil symbol represents an electromagnet or relay coil, and ground symbols show chassis ground connections. Wire colors are coded by abbreviation—BLK for black, RED for red, GRN for green, WHT for white, with a slash indicating a tracer stripe (BLK/WHT means a black wire with a white stripe). Connector reference numbers like C201 identify specific plugs in the harness, allowing technicians to locate test points on the vehicle.

Reading Wiring Diagrams

Diagram Symbol Language

Automotive wiring diagrams use standardized symbols to represent every electrical component. A zigzag line represents a resistor, a coil symbol represents an electromagnet or relay coil, and ground symbols show chassis ground connections. Wire colors are coded by abbreviation—BLK for black, RED for red, GRN for green, WHT for white, with a slash indicating a tracer stripe (BLK/WHT means a black wire with a white stripe). Connector reference numbers like C201 identify specific plugs in the harness, allowing technicians to locate test points on the vehicle.