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Eliminate the alternator 100% by disconnecting the main battery wire as well as the other smaller wires attached to it.
I to have found a slight drain on the battery measured as you indicated could well be considered "normal".
The key comment leads me to believe that putting in the isolation switch has solved the problem. If so, then indeed there is enough drain on the battery to draw it down overnight?
Pulling the fuses did not seem to help. Next thing I would do then is disconnect the main firewall to fuse block connection in the engine compartment. If it STILL drains down the problem is under the hood, not INSIDE the Van.
Do try to replace the battery with a loaner or some kind, at least for test purposes. I'm assuming you don't have the money or expertise to have your existing battery verified.
Ernie
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