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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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1,571 Posts
So im guessing i just had a bad alternator with the first one.
It happens. I ordered a new outside temp sensor recently and when starting the car it would read about 15 degrees low, then slowly creep up to accurate within 5-10 minutes. Returned, got a replacement (same brand), works perfect from start to finish.
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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19,338 Posts
Another issue to consider is that the other alternator may have been rebuilt in China with crap parts, or it might even not have been a Bosch - the market full of fake auto parts.
 
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