Confusing warning lights

For a while my '92 300D would light up the "exterior light out" light upon braking and would go out when I released the brakes and not come on
again immediately upon re-braking. The bulbs are correct and operational. I recently changed out my headlights with a pair of Sylvania SilverStars when one of them burned out. Idon't know if there's a connection but now I occasionally get a "generator" light when the brakes are on. It stopped doing it when I turned on the lights. The last weird thing was that I noticed that the light for the rear headrest switch was flickering, again, it stopped when I turned the lights on.
Any ideas?
TIA JD
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Sound like bad ground contact... check where there are whole bunch of brown wires. Clean up the contact with sandpaper.
Check your brake lights.
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