Auto Service Professional

OCT 2018

Magazine for the auto service professional

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30 A S P O c t o b e r 2 018 E l e c t r i c a l S y s t e m F a i l u r e s T By Edwin Hazzard It takes skill to traverse the correct diagnostic path The need to track down electrical system failures in today's vehicles are more preva- lent now than they were many years ago. With the addition of system add-ons such as in- creased safety items, more entertainment and crea- ture comfort options and overall improved vehicle operating capabilities, the technician is faced with the added complexity of performing proper diag- nostics. Today's vehicles have more control modules, more wiring, more harness connections and with all of that less room in the vehicle to access these changes. A major issue is the way the vehicle manu- facturers route their wiring harnesses. ey are routed in such a way that they try to make it all fit in a very small, confined space. Sometimes the harness routing isn't always optimum, and due to the cramped space and confined areas, the har- nesses themselves become stressed. A harness can be so tightly routed that the wire inside of the plastic insulation can break and you won't even see that with a good visual inspection. e opposite scenario is a harness that is routed so loosely that with vehicle vibra- Tracking electrical system failures Figure 1: Over time, improper harness routing can easily result in a direct short.

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