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On the most basic level, it could just be a case of the electrons not getting where they need to go due to loose, corroded or otherwise faulty battery/ground connections.
Other than that, it sounds like a dead battery caused by karma or simply bad luck, or a faulty alternator. While you had the battery on the charger for a while, it could still be a bad battery or a dead alternator. There are tests to isolate the cause.
Does the battery receive a charging voltage when the engine is running? Might be kinda difficult to test that if it can't start.
Many electrical accessories (alarm systems and sound systems alike) need a minimum voltage to operate. Lacking that, they won't. Make sure:
1. the battery can accept and hold a minimum charge level (>12.7 volts)
2. the alternator can recharge the battery at the correct charging rate (>13 volts)
Is the battery okay? Have it tested. You can't tell from an open circuit test without a test load placed on it.
Hope this helps a little. There's plenty of detail in the dead 911 archives.
Sherwood
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