When my '89 300E is at idle, all of the vehicle's lights (interior, headlights, etc.) flicker. The idle is good - not perfectly smooth, but as good as one can expect from a car of this age I suppose. The car runs perfectly in all other aspects. Is this an alternator problem? Voltage regulator?

When the car is moving, the problem disappears - no more dimming and flickering lights. I'm assuming that this is due to the higher engine RPMs and perhaps a more constant/higher output from the alternator? Any info appreciated, thx!

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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon