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S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

AC current.

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Old May 5, 2020 | 03:22 PM
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James Hewitt
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S320CDi
Exclamation AC current.
At idle engine there is AC current at the battery terminals, is this normal?
I am getting approx V 3.2 AC being produced by the alternator.
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Old May 6, 2020 | 07:25 PM
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James Hewitt
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S320CDi
There is no dash light, that is why it is so confusing!
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Old May 6, 2020 | 07:41 PM
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Originally Posted by James Hewitt
At idle engine there is AC current at the battery terminals, is this normal?
I am getting approx V 3.2 AC being produced by the alternator.
That's a bad diode in the alternator. Better replace it before expensive electronics start to go.
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