Parisitic draw

Thank You. I have done just that and looked at a lot of videos from Eric the Car guy and others. My problem is the battery drains overnight, but when i check the parasitic draw with the DVM on a full draw, it shows 0 amps and ive tried on all scales. That may be the case, but then what's drawing the battery down? The starter works fine. Bad something in the starter that draws the battery down? I've also checked the alternator on charging and its 13.8 - 14.4 in the good range somewhere anytime ive checked it. Battery is new. I've also disconnected the alternator overnight and the battery drains.... to me that says its a draw someehere and not related to a bad diode in the alternator. I'm out of ideas and ready to take it to my mechanic. ANybody have thoughts?