I have a 92 500E and am trying to figure out why it has a constant 1.5 Amp draw on the line to the module box with everything off. In trying to trouble shoot this problem I have found that when the upper engine harness is pluged in the module box draws the current. The harness is new. When the box is drawing 1.5 Amps, the harness seems to be drawing 0.5 Amp (all measurements were with a clamp on DC ammeter).

As an aside, Fuse circuit 9 is drawing 350 mA with everything off - measured with a test meter in series. Most I see (from electrical schematic) in that circuit is a few relays and a run to the Diagnostic Socket/Terminal Block. Also, the radio is not installed, however, alot of the factory radio stuff is still installed, though the head unit has been replaced ba an aftermarket.

Thanks,
Lee