if you had the time, you could pull out the entire engine harness and remove the wire to the alternator and run a new 4 gauge wire in its place. The problem is the alternator wire is taped and wireloomed into the rest of the harness.
There is nothing wrong with running a seperate power wire to the alternator and leaving the stock one in place tho. Just make sure the power wire is protected by some wireloom and ziptied securely.
I ran a seperate power wire once and didnt protect it. the movement of the car + heat in the bay rubbed a hole in the wire after 1 week and blew the fusible link to the alternator
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