Judging by the amount of wiring I see, it might be a better option to buy a new wiring harness and go from there. They make them for 12v conversions with an alternator and contain a detailed instructions on how to wire.
FYI, your alternator is a 10SI 3 wire alternator. The big lug on the back is counted as
as one wire and the DA connector contains two wires for a total of three.
I agree with bartamos, you don’t need that terminal block mounted on the drivers side firewall. Remove it and the wire that goes to the starter.
Last edited by Phak1; 03/12/2021 2:46 AM.