I've searched everywhere for someone who has experience replacing the positive battery cable. Here's the backstory: my car began emitting smoke through the vents, and the lights wouldn't turn off. Fearing a fire, I called the fire department, and they cut the battery cables. The car has been parked for 8 years, but at the 6-year mark, someone diagnosed the issue in a forum as a faulty light module, which was also causing my problem. Now, as I prepare the car for its first start in years, I realize that replacing the cable is not as straightforward as it is in most vehicles. I'm seeking any pointers or advice on this matter.

 

I haven't replaced the positive cable and hopefully someone who has will reply.
I would remove the battery if you haven't already. Then I would trace the original cable back to each connection. Take pictures of everything and connect the new one as you go along.
The service manual should have the information as well.
You can download the service manual here:
Service manuals, documents

I'm sorry that I can't be of more help.