1. WIRING DIAGRAMS

2. TYPES OF WIRING DIAGRAMS
ENTIRE VEHICLE
SINGLE CIRCUIT OR SYSTEM
SCHEMATICS
HARNESS (ROUTING) DIAGRAMS
COMPONENT LOCATORS

3. BLOCK DIAGRAMS
GRID DIAGRAMS
SCHEMATICS

4. WIRING DIAGRAMS IDENTIFIES WIRES , CONNECTORS AND COMPONENTS
SHOWS POWER DISTRIBUTIION
SHOWS GROUND DISTRIBUTION
SHOWS ENTIRE CIRCUIT OR SINGLE CIRCUIT
SHOWS DETAILED INFORMATION
PRINTED CIRCUIT BOARDS

5. ELECTRICAL SYMBOLS Symbols represent actual components
Sometimes shows basic operation
“Legend” interprets the symbols
Some show actual drawing of component

6. COLOR CODES AND CIRCUIT NUMBERING
wire/circuit identification
Wire marking, tags, color, tracers
Standarized color code SAE or Manu.
Diagram circuit numbering
Wire gauge

7. COMPONENT LOCATORS Factory service manuals Aftermarket manuals
Harness Views
Component views
connector views

8. TROUBLESHOOTING
Must use logic
consistent method
Parts of circuit