Lighting System Wiring Diagrams

The layouts of electrical circuits and their components are shown as diagrams made up of symbols and connecting lines. Being able to read a wiring diagram is probably the most important skill when trying to trace and correct a fault in an electrical system.

Not all wiring diagrams use the same symbols or the same numbering system. It is helpful to refer to the manufacturer’s service information for specific details on how to read a particular wiring diagram.

The illustrations below show some of the common symbols and what they represent.

  1. Figure 39-30 shows the battery and fuse symbols.
  2. Figure 39-31 shows the ground and connector symbols.
  3. Figure 39-32 shows the switch symbols.
  4. Figure 39-33 shows the resistors, coils, and relay symbols.
  5. Figure 39-34 shows the semiconductor symbols.
  6. Figure 39-35 shows the capacitor and device symbols.
  7. Figure 39-36 shows the motors, generators, and solenoid symbols.
  8. Figure 39-37 shows the gauges and warning device symbols.
FIGURE 39-30
Battery and fuse symbols.
FIGURE 35-31
Ground and connector symbols.
FIGURE 35-32
Switch symbols.
FIGURE 35-33
Resistors, coils, and relay symbols.
FIGURE 35-34
Semiconductor symbols.
FIGURE 35-35
Capacitor and device symbols.
FIGURE 35-36
Motors, generators, and solenoid symbols.
FIGURE 35-37
Gauges and warning device symbols.