Interesting that you pointed that out. I did check the connector going to the top of the compressor, but I only got about .2v then I checked the high pressure connector and got about the same. I switched off the car and it went to 0. Is this right or should it be 12v? I tried jumping the connector and got no engagement. Also, I am not sure, but my fuse panel doesn't seem to have an a/c fuse. There is a relay that controls the fan, which also controls the a/c according to what's listed on the fuse panel cover and there is another relay next to it for high speed fan.

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1990 190E 3.0L