One thing I found in disconnecting my radio system was that the large control unit in the right trunk wall area was also had to be disconnected. In the 300CE that is where that apparatus was mounted. I have aerial cables going back both sides of the car, connecting to that complex control unit for the radio, plus the electric aerial on the left rear. I pulled that radio control unit totally out of the car and disconnected all aerial leads and power to the aerial from everywhere. That stopped the battery draw. Hope this helps a bit ... Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)