Sn95 120amp Alternator Upgrade ??

Hello,

I upgraded my alternator awhile ago and I think I might have missed something. I replaced ran new wire to the battery and new ground wire. Drove my car home it ran fine everything seemed cool, my reg was expired so it sat for a few months. Battery was dead when i went to start it so i jumped it and drove it to work, battery was dead again so i swaped it out with another new Optima. Then on the way home my battery was smoking brand new Optima down the drain again. Anyone have any ideas if I missed something or did my alternator go bad again? Any ideas let me know, thank you.