In addition to the bypass under the hood,I ran a wire from the starter relay with a fusible link again,and directly hooked up to the ammeter gauge.
This bypasses the bulkhead connector.
Next wire is from the discharge side of ammeter to the battery stud of alternator.
This still gives the ignition switch power and save your Nike walking shoes for another day.
I agree this makes the ammeter reading not accurate but still gives a "rough" idea.
I typically use a multi-meter to test the charging system if I think I have a problem.

I run a Powermaster 70 Amp roundback alternator with an Autozone VR706 electronic voltage regulator in my 68 Newport no problems.

Running relays for the headlights and converting all other lights to LED helps as well.
Hope this helps.