RPM seems to have an effect, at idle the flicker is most noticeable, and it gets a bit less so as the RPM goes up. My idle is very steady, no surging or any or other strange business, though I get a bit of shake from the front at standstill (I think that's worn out motor mounts though).

My tech said the alternator could be on it's way out when I had the regulator replaced, but also said they usually last up to around 230k and to see how it goes.
I'm due an oil change soon so I'll see what he says.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys