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.
If the wiring isn’t labeled already, label each wire or harness with the name of the components they route to. If the wiring or harness will be going through the firewall, use a grommet in the hole so the sheetmetal won’t cut through the wires. Don’t secure the connectors until the wiring is through the firewall.
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