I'm a 300TD diesel head so I rarely come over to this side of the fence. My nephew emailed me last night with this question:My 2003 C320 Mercedes isn’t charging. I got a code P0563 – System High Voltage. I multi-metered the battery:1. engine off at 12.1V 2. engine on 11.3V 3. engine at 2000 RPM 11.1V I’d say it was the alternator, because the voltage didn’t climb above 15-18V. Voltage regulators are supposed to limit how high the voltage gets. The battery is 7 years old. I thought perhaps the P0563 was triggered due to the VR trying to get the voltage high enough to charge a marginal battery. Any opinions?

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