See the Pic.

This is from over on another Forum. The short story is the Charging Light seems to work OK but Alternator does not want to charge until RPMs are up.

I am just wondering if the corrosion on the Metal Contact Spring inside of the Alternator could cause the Symptoms in the thread.

Yup, another alternator thread. Stumped. - Mercedes-Benz Forum

I also thought that this is a area that someone might not check.

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84 300D, 82 Volvo 244Gl Diesel