What is your EHA current KOEO (key on engine off)? I'm not sure what car we are even talking about but 90% of them should read 20ma.

There is NO difference between a EHA unplugged and one that reads "0 or negative". You need a few milliamps to have any effect disconnecting the unit. Anything else is coincidence or wishfull thinking. If those are your numbers and you are really getting a running difference I'm guessing you meter isn't reading properly. That is the main reason for the KOEO test at 20ma.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician