u/Beneficial-Tie1912

I have a taramps 400x4 to power 2 door speakers and 2 speakers on my rear deck. I have 2 kicker 10" compcs powered with a Rockville db12. I also have a big 3 upgrade done with 1/0 gauge wire. I had my first alternator die about a month ago and figured it was cause it was old and had alot for miles on it. I replace it and the new one is allready not charging the battery enough. My first thought is I need a high output alternator but before I spend that much is there anything I should check for that I'm missing. Any help will be appreciated thank you.