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Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.
If the main fuse were blown you would have no power to anything. The car would act like a completely dead battery and would not jump start.
You need to measure current drain when the vehicle is sitting. Remove negative battery cable. Connect ammeter in series with the ground cable and battery. Observe current measurement. Start pulling fuses one at a time until the drain drops, this will narrow now the circuit causing the problem.
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