You could place a taillight bulb in-line with the ground cable and the battery post. If it lights up, with all things off, you have a drain. Then, pull all the fuses out of the fuse panel, one at a time, until it goes out. This will narrow down the drain to a possible fused circuit.
You can take a voltmeter and check the big cables for green corrosion/bad wiring as that stuff stops current flow to a battery. Most cars connect the alternator at the starter terminal and then go back to the battery.
Put the voltmeter leads, over the top, with the cables connections and the voltmeter should read at zero volts or no more than 0.02 volts. It is a quick check for the condition of them and easy to supervise!
Hope you get good repairs on all you have going on.
Phil
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