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Hello sorry to hear of your problem it does sound like you have a parasitic draw. To check this we will need a voltmeter that will read amperage and in the milliamp range do you have this
With the negative cable disconnected the amp meter will need to be hooked up in series between the negative battery post and the negative battery terminal this will allow us to take a reading of the exact amount of current the draw is consuming and we can begin isolating circuits by removing fuses while monitoring the amount of current once the draw goes away we will know which circuit by which fuse we have pulled
An alternator can be the source of your drain even though it is charging if the diode fails another common problem is a door jamb switch sticking and causing the gem module to stay alive because it is tricked into thinking the door open or the gem module itself could be faulty.
I am more than happy to help you with a phone call and can walk you through this test it looks like its waiting on your payment.
Do you have a ammeter available?