I pulled eha numbers again this afternoon. I get nothing- 0.0mA. unplugging EHA does nothing to the way the cars starts runs.

Maybe my setup is incorrect?

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E