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So my 2013 GL450 is at 192K miles and I figured I'd replace the alternator preemptively.
Just for reference, here's what the brushes on the voltage regulator and the corresponding copper shaft looked like. Brushes were at 2-3mm. So if your GL is getting to that mileage, I'd say it's time to replace at least the voltage regulator.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
