Not charging with headlights on

So, this probably doesn't belong in this thread but considering everything that's been going on with my car, I thought I'd try.

So now I'm getting between 13 and 14.5 at best at the battery and the voltmeter. I took it out for a 30 mile run just to check it out and all was well. When I go to start it today, it will run for a little then sort of starve out. There seems to be plenty of gas in the carburetor and it runs strong at high idle but chokes out when I let it go. This is totally new behavior and I'm wondering if I might have messed something else up? I did change the ballast resistor to make sure.

Any thoughts?