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· Registered
2008 CLS550, 1993 300SE, 1987 560SL
18 Posts
Discussion Starter · #1 ·
My idle seems to surge (although not much, maybe 100 RPM), and the voltage seems to surge w/it. The higher the revs, the stronger the voltage surge. W/O putting a voltage regulator on it, it seems to be spiking, not dropping (IE: 12v ^ 15v+). My windows stop working, and the radio & climate control cut in and out, not to mention what other problems this could be causing. Any ideas? Bad ground? Voltage regulator? Loose batt. cable? Alternator? :surrender:

Thanks in advance!


· Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550 FORMER: C300, ML350, CLK550 Cabriolet, C240, ML320, 300TD
25,443 Posts
With the overvoltage, I suspect a bad regulator. This part can be replaced by itself - i.e. you don't need to replace the entire alternator.
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