A wiring harness in the engine is a set of wires, connectors, and terminals which run all over the vehicle for relaying electric power and information. The harness plays an integral role in connecting a number of important components of a vehicle. The wiring harness is just like the central nervous and circulatory system of a human body which pass information and power throughout the body.
The wiring harness connects to the primary fuse box, or all fuse boxes on some models, under the hood. The fuse box takes power from the battery, which is in turn charged by the alternator, and protects the wires in the harness against surges that could damage sensitive components. The wiring harness provides a series of connections that allow experienced mechanics and vehicle owners to narrow down problems to specific systems and electrical connections, making it easier to work on the vehicle’s electronics.
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