73 Dart Alternator doesn't show charge anymore.

SputnikOne said
What I mean by splice is on my car there's a red wire that's spliced into the fuse, which I was told was also from factory on some cars, not sure what it was used for.

The wire is NOT factory in any way.

OEM wires will not say "primary wire" on it and the blue crimp connector is not used on OEM wiring harness. Lastly, taps on fuses are not used.