I've been having a battery darin on my '95 E320 and found this thread so I am re-awakening it again in case someone runs into this again.
The first thing I suspected was a bad diode in the alternator so I yanked the battery to have access to the terminal where the cable to the alternator is attached. replaced battery temporariy and using a dc ammeter I measure the leakage again and it was still arond 1.5A on a 10 A analog meter.
pulled fuses one at a time and only the fuse for the radio etc made a tiny deflection under 0.1A not anything to consider a significant amount of current.
I disonnected the antenna motor in the back, nada
I lthought of the relays behind the battery and pulled the cover.
Out of curiosity I disconnected the ABS module Voila! thats it!
Now waiting for a used ABS module to see if swapping it will remedy the problem, if not that then I suppose it could only be the ABS valve assy. I dread havng to replace that!
It was sugested that another possibility is the key switch is not disconnecting the ABS circuit. If I had a good wiring diagram I could check that out. Wil have the module in soon and report more on this later.
DDH
PS
Meanwhile I'm running w/o the ABS working, the module disconnected. Anyone done that before?

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!