73 Dart Alternator doesn't show charge anymore.
OK. That's the safest way.
I would remove and clean all of the terminals in that connector.
Look carefully at the condition of the J2F and G. It may have failed right there.
Lemme find the pictures for how to remove and add them to this post.
Depress the side of the male terminals. Then push out the back.
For the females, there are tools for this but filing somehting like a cotter pin flat will work too.

Slip the tool in from the front to depress the tab, then the terminal can be pushed out the back.