Mine is also doing the same situation when the lights are on and at a stop. It annoys me but you can visibly see the lights pulse in a reflection with a car in front of me. Once I'm off, the pulsing stops. My car is charging at 14.2 at idle 800rpm. If I drop the idle to 650-700rpm it will pulse more and lights seem to dim. Does this also spell and Alternator or Voltage Regulator? The belts are new as well as the battery.

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MB roster
'85 500SE euro Ratrod
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'91 560SEC w/43K stored
'92 Cabby 16V OE 2.1 AutoX car
JDM RHD cars now.