It sounds like you have a bad ground. follow all your ground wires. should be one to the engine, body, and maybe frame. disconnect them and clean the surfaces with sand paper and reconnect
SOURCE: electrical short
Your problem is pointing to the alternator. Since you say the alternator is only a year old, the I would check the tension on the belt (deflection should be about 1/2 an inch), and the belt itself. Your problem most likely lies in either the belt, belt tensioner (if applicable), or alternator.
SOURCE: Electrical system failure. Replaced alternator,
Sounds like a short in the system. If you can put a charger on the system, I recommend you pull the fuses one at a time and look for a spark when reinserting them. There are only a couple circuits that should spark when the key is off. After narrowing it down that way, you can start checking the wires and components on those circuits that sparked. You can also do this with the fusebox in the engine compartment.
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