Please HELP!!!, New alternator, but dead battery! Options

[str8thugginit4ya]

Ok, so I ordered a high output alternator and installed it today. Now as I finished installing the alternator, I cranked it up and let it run for a while. The battery I have in there right now is a Everstart ( one of the small ones ) and only had it for about 1 year. Never had a problem with it even when I installed my system. Now after installing the alternator, I started to crank up my system and then whole sound system cuts off? So I shut off my car for about 2 minutes, now when I go to start her up again, battery is dead! Even when i jump started it and had the car running the current was LOW! If I were to turn on my headlights, then my rev would drop and lights would dim. I have a Tsunami 1.2 farad capacitor as well. My whole system is a JL Audio 450/4 & an MTX 600/1. Is there some reason that my battery died just like that, and the current in the car is running low when it's started? I thought high output alternators was supposed to save your battery not kill it? My voltometer is reading about 9 volts when started and running! PLEASE HELP ME OUT!

[brthrurik]

sounds like you either got a bad Alternator... or you got and alternator that is only high output when revving high. a lot of the "high output" alternators put out below factory at idle but higher as the engine revs.