Auto Service Professional

JUN 2018

Magazine for the auto service professional

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10 A S P J u n e 2 018 C h a r g i n g S y s t e m s W By Edwin Hazzard When you talk about diagnostics in the automotive industry, the first thing that usually comes to mind is a computer problem like an engine system, anti-lock brake system or maybe even a body con- trol issue. Diagnostic issues can be caused by a multi- tude of different problems ranging from control modules, solenoids, sensors or even wiring and or data malfunctions. is article focuses on an area of the diagnostic puzzle that is oen over- looked in our diagnostic thought process... the electrical system, predominately the starting, charging and battery systems. ese three systems can have their own set of diagnostic issues, but nevertheless need to be diagnosed correctly. Sometimes it's in one of these three component areas that is causing your computer system to not work properly and it just might not be a computer system problem aer all but an underlying problem. In my last article (December 2017) I talked about how the battery is the heart of the electri- cal system and that's where the vehicle's so-called lifeline starts. When performing an electrical system diagnostic, always start at the battery. Years ago the automotive battery was rela- tively simple and not too sophisticated as com- Diagnostics evolve with system complexity harging and Battery and charging technology, along with ever-expanding on-board electronics, continue to evolve and increase in complexity. is article by noted mobile diagnostic technician Edwin Hazzard offers insights and tips for checking battery and charging system health and diagnosing related issues. Figure 1: This battery is rated at 950 CCA. Testing with cables attached. Notice the reading displayed on the tester in Figure 2 at right. starting

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