Tacoma wont start on its own

Ok so here's whats happening. My truck will not start on its own but after maybe 20 seconds of jumping it with anoter truck it starts up fine and runs fine. I just had the alternator replaced 4 months ago. When I turn the key nothing happens. No clicking no nothing. I do run a train horn and compressor and 2 10" subs. Are the accessories killing my alternator or is it something else? Help me out cause im stuck.