Alternator isn't an issue at this point as with a good battery it should still start and run just not run for long. Does it make noise as though the starter motor is actually trying to turn over? If the starter is turning and trying to spin the engine I'd turn my attention maybe towards fuel pumps, spark plugs etc.
Audio: JVC KD-ABT22 / JL sub+speakers / Sound deadening
Engine: WR-SRI / RRM 25% UDP / 6G75 TB
Other: RA Mudflaps