What is this wire

Hey everyone
My 67 Barracuda has a large wire almost 1/4” dia going from the alternator post to the Starter Relay ( #8 ?) I’ve traced it out and for sure it is NOT fused or fusible link.
I’m sure this wire was added when the Ammeter bypass WAS done by the previous owner during the Restomod process just prior to me buying the car 3 years ago.
I just did the Crackedback headlight harness upgrade which was a huge success ( MUCH brighter headlights and safer for wiring) and am trying to sort out other potential problems
Question 1:should this wire be fused and if so HOW do I do it? It’s the Big RED wire on the right in both photos
Question 2: What is the purpose of this wire?
Thanks in advance
Joe

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