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What would cause alternator over voltage on occasion? Doesn't do it all the time. I've ordered a re manufactured replacement. When the voltage goes high all the electronic systems quit. ie: the radio goes off, windows won't roll down, top won't go down BAS, and other fault lights. The alternator is a fairly new remanufactured replacement. The only visual flaw is burned connections for one of the winding phases.

When my replacement comes, I plan on running a separate ground wire from the alternator housing to the chassis to ensure ground integrity. Beyond that I'm perplexed.
 

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Premium Member 2006 SLK350
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First question would be, quality of this alternator? I would think it's the voltage regulator, which I believe is integral.
 
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