Burned bulk head connection

I went through the engine wiring harness and found out, that the connection for the black cable, comming from that Alternator, is badly burned. All other connections look quite good.
After reading some posts here, I learned that this is a common Mopar problem. For now I don't want to dissemble the whole dashboard, but I am checking the all accessible connections and cables. I am planning to uninstall the dash next winter.
Anyway, this connection has to be addressed immediately.

So that's the plan for now:
Remove the faulty connector and widen the hole with a drill. Run a new wire from the alternator through this hole and connect it on the inside of the fire wall to the other black cable. I would like to use some quality plug for the connection. The engine harness would still look original.

I found an interesting article about running a parallel wiring from alternator and starter relais to the ammeter. I am planning to do the same but not sure if that would make much sense, and what kind of wire and fuseable link (sizes) to use.
I have to confess, that wiring is not one of my strong points.
Appreciate any opinions and advices on my plan. Here are some pictures, showing the burned connection and the wiring diagram I am planning to follow.
Thanks Wolfgang

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