73 Dart Alternator doesn't show charge anymore.

Good news.

SputnikOne said

Would you recommend doing the 5A test again but with the red cable in? You guys said it was for the brake light switch and if that's so I'd of course like it to have power, but I'm not sure why its spliced in like that

Click to expand...

I doubt the red wire spliced into the fuse is for the brakes.

With it removed what doesn't work?

Tracing out where the red wire goes should be the first thing you do but reinserting it with a 5 amp fuse should cause no harm.

Before you do this with the fuse removed determine which side of the fuse holder is powered, and don't put the red wire on that side of the fuse.