Depending on the damage and how far back on the wires the damage is will tell if you need a new harness or not. If you have no electrical background i wouldnt suggest doing this yourself. If you do know how to add connectors and the connector pins then if the damage is confined a few inches back of the connector you should be fine. A number of things may have caused the meltdown. Water, oil, tranny fluid, a bug, pretty much anything that can cause an electrical short. Or your computer suffered a massive short which drew too much current burning the connector.
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