Alternator or wiring?

Went out to check some connections. The green field wire on the alternator was very loose and pulled right out of its spade connector. So, I'll start by replacing that and then see if the problem persists.

Thanks for the detailed rundown, 67. I had seen that article but it's been a while. The ammeter bypass is on my list as the car, when I got it, already had a burned-out connection replaced elsewhere on the charging circuit under the hood.