Carrying the blood-electricity analogy a step further, your car’s electrical system’s heart is your battery. The battery supplies all of the power to keep the entire electrical system running, with the assistance of the alternator which ensures that the battery maintains its power. The initial portion of your engine wire harness carries electricity from the battery t the fuse box where it is further distributed.
The engine harness is typically a large bundle of individual wires protected by a shell of insulation and conduit which helps to protect it from the elements. It is often asymmetrical, with the large end close to the fuse box and becoming smaller as it branches out over the engine. Since the various automobile manufacturers have different engine designs which also change over time, engine wiring harnesses are often unique to the year, make and model of a vehicle. Because of its proximity to the engine as well as contaminants on the road, engine wiring harnesses can degrade and require repair or replacement.
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