Electrical Wiring Diagrams

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use pictorial representations with a mixture of schematic symbols and internal wiring. A linear diagram may start on one page and continue onto several more a map out individual circuits with a separate diagram. Above - A pictorial or map diagram of the electrical system of a 1968 Ford. Schematic <strong>Diagrams</strong> Schematics are line drawings that explain how a system works by using symbols and connecting lines. Several different standards for schematic diagrams exit DIN and Valley Forge are the most common. Symbols are used to represent devices or components of both simple and complex electrical and electronic systems. Schematic diagrams present a great deal of information in a small amount of space and the reading of schematic symbols requires practice. A logical, stepby- step approach to using schematic diagrams for troubleshooting begins with the technician's understanding of the complete system. Schematic circuit diagrams may be supplemented with diagrams, tables, graphs or descriptions. Current path are arranged to show signal or mechanical action from left to right and or top to bottom. Block diagrams are used to represent complex electronic circuitry such as a electronic control modules. On these devices, no internal circuitry is shown and only inputs or outputs are depicted. Dotted lines may represent an area or some mechanical action taking place with a component The two most common types of schematic diagrams used today are: � Valley Forge � DIN (Deutsche Institute Norm)
SAE symbols are used by Valley Forge where DIN symbols are used together with DIN diagrams. DIN diagrams are used by many heavy-duty manufacturers. Symbols, terminal connections numbers, line symbols, operational status in these diagrams are defined by a DIN standard. These diagrams may be accompanied by illustrations showing internal circuitry of some devices and reference coordinates used to assist locating components. Valley Forge wiring diagrams are similar in content to DIN diagrams however SAE coding and symbol are used. Conductor sizes, symbol representations, component and terminal designations are different from DIN standards. Above – An example of a linear/pictorial wiring diagram. Vehicles today are wired using sections known as looms or harnesses. Harnesses are prewired for sections of a vehicle. The harnesses are enclosed into protective loom and taped so it is not possible to completely trace a single wire to find a problem. Schematic diagrams are needed to check the circuit at strategic points.
Page 1: Learning Outcomes Electrical Wiring
Page 6 and 7: Elements of a Wiring Diagram DIN di
Page 8 and 9: Wire Sizes Wiring diagrams also ind
Page 10: DIN Symbols
Page 21: Valley Forge - GM, Ford

Electrical Wiring Diagrams

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