1965 Dart Charging System Question

Mattax said
0.6 V Does seem to be a somewhat big drop between the battery and the ignition with nothing else on. Could be battery feed or ground.

If you want to narrow it down..
With key in run, measuring at the alternator output will show the voltage at the welded splice (since there's no current in that leg)
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If there is drop then measure between the battery positive and each of the next junctions.
Also check battery negative post to engine and body (grounds).

The ammeter always reads in the middle (just a touch to the right of center, actually) after a few seconds of startup. I'm sure I've checked the grounds, but I'll check them again next time I'm out there messing with it. I believe today that I checked the battery voltage going into the bulkhead connector and it was the same as battery voltage, which would seem to mean that my trouble is under the dash. I couldn't get my Power Probe all the way up to the ammeter today, and that's where I decided to quit. I'll try again with the multimeter next time.

I'll also check out the alternator output with the engine off and see what that says.