Battery keeps draining over night Checked fuse box for any fuses carrying volta

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found a 5A labeled EEC pulling 7 DC volts a 30 A HTD SEAT pulling about 7-9 volts and a BTN! 40 A pulling 12 volts I have had the alternator changed out no help I had to install a kill switch to get around the battery problem I would like to know what this could be.... Thank You davidg718