Yes, I know I screwed up bad with this one. I listened to someone who thought they knew what they were doing (but don't as I can attest to now) and tried to patch the ground that had broken from the coil to the engine block. (I was ADD and couldn't wait till next week when the ground comes in from Germany)

Long and short is that 1 wire super heated and melted most of its sheathing away. Its the red/cream colored wire that goes from the ignition coil to the fuse box, into a plug then out the other end. I inspected every bit of it and discovered that the wire is the only one w/ exposed copper - which is good. The bad part is that I have no idea where this wire goes to beyond the plug. I saw it route down under the area w/ the other relays and off it went.

So now I need to fix this ASAP as I am afraid of fire. Where does that particular wire go/is there a wiring scheme that anyone has that will tell me (the car still runs fine by the way)? How much work am I looking at to replace the entirety of that harness (I can't even find them online to buy)?

Also, if the car is working fine as it was before, should I be as concerned as I am right now (on a scale of 1 to 10, I'm roughly an 11)?

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87 300E
202k on the clock