Just went out, car was cold (around 45 degrees here overnight). Battery was at 11.8 when I first turned key on, started the car and it went up to 13.9 and has been hovering between 13.6 and 14.1 regardless of the accessories I turn off or on.

I think I'm still going to replace the alternator again to see if that solves it. I'm assuming it had a voltage spike when I floored it on the highway and that tripped warnings.