time2roll wrote:
Put your clamp-on DC ammeter on the battery cable and see what moves.
Nothing will "move" but if there is a draw, it should register. This is a case were "bigger is NOT better" ! You don't need a 600 amp-clamp meter. 100A is plenty. Around $50 on Amazon.
The next step is narrowing it down. Take you DMM and set it to the lowest voltage available. Open the fuse box under the hood, and place the test leads on each small metal contact on top of each fuse. If there is no draw, it should read zero.
If you find a suspect, remove the fuse and double check the total draw at the battery. Now you need a wiring diagram !
Remember, all the fancy electronics take up to 5 or 10 minutes to go to sleep, so wait for them !