Auto Service Professional

OCT 2018

Magazine for the auto service professional

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O c t o b e r 2 018 A SP 31 tion the harness has too much movement and can rub up against a sharp object like a bracket, a high heat source or any other object that will compromise the wiring insulation or protective conduit covering. A perfect example in Figure 1 shows what happened to a harness over time when it is rout- ed incorrectly. is issue was a direct short to ground. Figure 2 shows a harness that has rubbed on a transmission case flashing. It, too, was rout- ed incorrectly. e vehicle electrical system is like the hu- man body. e wiring in a vehicle is similar to a complex network of veins. Both act like a highway where they provide a path for movement. If a vein leaks then the pressure isn't as high as it should be. e same thing occurs with a wire. Voltage will be lost if the wire is compromised. In an elec- trical system, the two biggest factors which cause electrical failures are moisture and heat. Both create havoc and both can feed off one another. If an electrical circuit has high resistance, then naturally it will be overheated. Overheat- ing over time will damage the circuit and cause it to fail. Tracking down the cause of the excessive Figure 2: This harness rubbed on a transmission case. Over time, it chafed through. Figure 3: Excessive moisture entered this connector, resulting in a complete circuit failure.

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