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The "ignition" wiring harness, meaning the actual spark plug wires, are replaced every 60k miles and cost about $35. This is a job you can do yourself, or ask your mechanic to do in about ten minutes.
The "engine" wiring harness consists of a large collection of bundled wires leading to and from various sensors and controls. In pre-88 cars, it deteriorates because of faulty wire insulation. You buy it as a unit from a place such as IPD and install it as a unit. It is time-consuming to replace.
It has nothing to do with the alternator function (unless the wires are shorting). You can remove the alternator and have it completely rebuilt at an auto electric shop for about $75.
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