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You need to perform a parasitic draw test. The battery could be going dead for a number of reasons. The only way to diagnose a battery drain is to measure current draw. You need a multi meter set to amps. remove negative battery cable and connect meter in series with negative cable and negative post on batter. You will then start removing fuses one at a time until the meter reads the draw has gone down. Once you know the fuse you will be able to narrow down the circuit and the individual modules on that circuit need to be isolated.
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