You'll have to hook up a test light to the battery, in series with the disconnected positive cable, and if the light lights, you have a drain (all doors closed, everything off, of course). If you don't get a light you still might have a small drain that you can detect with the milliamp gauge on your voltmeter. If you get a light or an Ma drain, then you just pull the fuses one by one until the light or meter goes off. Then you know at least the circuit. But finding the actual bugger still might not be easy when you have multiple items on one fuse. I have a similar problem and I know the fuse circuit but I can't find the actual drain, so I pull the fuse and now I have no dome light or radio. I'm going to rewire the radio to another circuit and I don't know what to do with the dome light issue.
As for the door latch not working, you might pull that fuse and see what happens to the test light.
There is a master switch in the driver's door that I suppose could b draining the battery
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