My alternator wire melted.

I have a 1971 plymouth scamp. I was tuning my carb after a cam swap when I noticed flashing coming from inside my alternator then my engine died and white smoke was pouring out from the harness. Even with the engine dead it kept burning until I disconnected the battery. The blue wire that plugs to the alternator field melted all the way to the firewall plug. It splits off to the voltage regulator but that wire didn't melt. The green wire that comes out of the regulator that goes back to the second field had broken strands at the connecter and broke off after a couple of wiggles. I also found corrosion inside the firewall plug. So I'm thinking it must be one of the two that caused it but not 100%. Anybody have input. BTW it's a new alternator with 2 engine hours on it.