I have a flickering problem that just started today. The flickering was very noticable. The headlights and dash lights had the appearance of a highway patrol when the headlights flash off and on. I'm pretty sure its the alternator as it only does it when the engine is running and seems to speed up with engine speed. It didn't do it the last time I drove it two days ago.
I had the sme problem before that the lights would flicker as was solved by replacing the alternator. The alternator was charging steady at around 14 volts so I was puzzled. I was told the diodes go bad as cause spikes that are not detected by a voltmeter but show up as other symptons as flickering lights.
I will keepyou posted.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T