As you know, electricity travels in a current. The purpose of the fuse box is to stop the electrical current if it becomes to strong, thereby avoiding an electrical fire. The wire harness carries the current from the engine back to the fuse box, usually found under the driver’s side dashboard. When power reaches the fuse box, it is then redirected to the various different electrical components of your car, including back to the engine, to the overhead light, to your instrument panel and to hundreds of other vital components.
In these types of situations an entire portion of harness may need to be replaced. Since harnesses come in all sizes from small and simple, to large and complex, the cost to purchase and install them covers a very broad range. Some vehicle manufacturers also specify harness replacement, rather than wire repair, on certain sensitive safety systems such as airbags. This type of specific guidance varies between manufacturers and can be found in their service information.
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