Wires or lines in circuit diagrams are usually horizontal or vertical. To read a wiring diagram first you have to know what fundamental elements are included in a wiring diagram and which pictorial symbols are used to represent them.

407 Electrical Wiring Diagram Symbol Legend Wiring Library
Reading a wiring diagram. Learning to read car wiring diagrams is an awesome skill to add to your auto mechanic skillset. In some cases a diagonal line may be used which is placed at 45 degrees. To understand how to read ladder wiring diagrams lets start with a simple electrical schematic consisting of a power supply switch and light then you will move on to our control panel sample wiring diagrams. Indicates current flow downward or upwardascontrolledbythecontrolunit. To read it identify the circuit in question and starting at its power source follow it to ground. Im an auto technician for over twenty years ive always loved the electrical side of auto repair.
Component symbols in a circuit diagram are usually placed horizontally or vertically. How to read the wiring diagrams how to read circuit diagrams a 5 indicates inputoutput tofrom controlunitcurrentflowdirection. Being able to master this competency will not only help you find solutions to common electrical problems a lot faster but will also give you a big headstart compared to less qualified technicians. Use the legend to understand what each symbol on the circuit means. A car wiring diagram is a map. Input output input output in case two or more connectors are connectedtothesamedevicemarkings indicating the same connectors are connected by a broken line.
The common elements in a wiring diagram are ground power supply wire and connection output devices switches resistors logic gate lights etc. On very rare occasions a component may be placed at 45 degrees but only for a very good reason.