First, thank you to one of the list gurus who suggested checking on
shorts between O2-cable and its shield.  I had one of my own causing.

When the O2-sensor is connected and I measure the voltage between the
connector and engine ignition control module heat shield, I am getting
around 0.46 volts with engine warmed up.  Voltage is rather stable with
engine at idle.  Am I in the ballpark?

With O2-cable unplugged, resistance between connector and ground on
cable to O2-sensor is infinite.  Resistance between other connector and
ground on cable to ECM is 173000 ohms.

I am not sure what I am missing, but engine runs well, but is running
very rich.

John