Hi All,
The car I am working on is a 1987 420 SEL as the thread title suggests. Recently, I had the fuel distributor professionally rebuilt. It came with instructions saying to adjust the fuel mixture with the 3mm hex screw with the engine fully warm. I hooked up my digital meter set to read mA (was looking for a reading of around 1-3 mA as indicated in the instructions sent with the rebuilt FD). Upon doing this I cannot get any reading on my meter with the car idling and the leads connected to the EHA harness (connecting into the wire closest to the FD). Why would this be? I already tried replacing the OVP relay with a new one thinking that would power the EHA, but that didn't make a difference. Where does the EHA get power from?

Thanks in advance,
Dave