JFB,
the battery lamp is on when engine off and ignition on.
the lamp does not flicker when the amp goes negative.
I have a rather new aftermarket regulator and the - most likely - original motorcraft DT3F-10316-AA. Have tried both; no difference visible on the ammeter.
Have put on an additional ground connection from the regulator to the chassis. No change as it seems when starting the car in the garage but I have to do a test-drive during the next days to check this out better.
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