1987 735i ,Battery Draw

Hi, I have a car with a continues draw that will kill battery after 2 days. The battery has been replaced and the alternator. I also disconnected the stereo, driver, passenger electric motors and clock. Checked for draw for 2 hrs every time is happens and it's always below 50milliamps after 16minutes. Has anyone had similar issue and got it solved...
Please help ...thanks ...

Had this problem on my wife's classic car. Finally bought an electrical disconnect switch from an RV supply house and it cuts power to everything (including the alarm, which had to be rewired around the cut off - oops). I also keep a Battery Tender on everything I own. Get the heavy duty one at Camping World. Buy the extended warranty if you get the lighter weight one.