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We use wiring diagrams in a number of diagnostics, however if we're not careful, they can lead us for making decisions aren't accurate, trigger wasted diagnostic time, unnecessary parts costs for that replacing parts who are not defective, and sometimes even missing a simple repair.
Today, the wiring diagram necessary to support a given repair procedure is included within that article or a link is provided to the perfect SYSTEM WIRING DIAGRAM article. One example is, the wiring diagram for the Ford EEC-IV system might be built into ENGINE PERFORMANCE and WIRING DIAGRAMS articles for Ford Motor Co. The wiring diagram for any cruise control system may be found in ACCESSORIES & EQUIPMENT section for the actual vehicle manufacturer, plus the wiring diagram for the anti-lock brake system could be a part of BRAKES and WIRING DIAGRAMS for the particular manufacturer.
Within my recent multi-part series on automotive electrical systems (which included primers on how electricity works and how to utilize multimeter), I gave a shorter troubleshooting example wherein I often went a multimeter to ensure that voltage was present. If a device—say, an electrical motor—isn't working, first determine whether voltage is reaching it if your switch that powers the system is turned on. If voltage is present in the device's positive terminal, test for continuity regarding the wire for the device's negative terminal and ground (first the body of your vehicle, while the negative battery terminal). When it passes those tests, conduct a voltage drop test to search for a high resistance failure. When the voltage drop test shows no issue, the device is toast.