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I have a W203 (US 2003 C230 Kompressor) with 96,000 miles. When starting the car in cool/cold weather (50 degrees F or less) the "Battery/Alternator Visit Workshop" light will come on. Thinking that my battery needed to be replaced anyway, I went ahead and did so. The light still comes, but only when the temperature is about 50 or less. If I turn off the engine and wait (anywhere from 30 seconds to 2 mins) and then restart, no warning light. Leave the car (again in the cool weather for 8, 9, 10 hours or more and I'll get the light again. My mechanic has checked the battery and alternator. Everything seems to check out fine. Mechanics at my job have also checked it.

The alternator is a Valeo, not a Bosch. I've seen similar posts but there's no definitive solution. Obviously I don't want to replace the alternator if that's not the actual problem. Could this be the voltage regulator?
 
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