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Did the other side of the firewall burn too? I ask because if it shorted it seems the entire length of wire would heat and burn the insulation off the entire wire length on the hot side of the short. Is the engine the hot side for the wire in question or the cabin side?

Also, thanks for the link to the video removing the dash. I might have a bad heater core and it is nice to know what I am getting myself into if I tackle it myself.
 

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No burn on the drivers side at all. It’s a possibility the car was parked when it happened and went out on its own. No fire extinguisher residue was in the car. Either that or the driver shut the key right off so most of the wires had no power to them. The main harness only burned in that area on the passenger side.
Usually the wire that grounds out will have its isulation burned off from its power source to the grounding point. Maybe I'm missing something but the red power wire seems to have its insulation still intact.
 
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