Quote:
Originally Posted by Zacharias
What you describe isn't unusual, depending on how long it stays on.
On these old cars, the voltage regulator needs to "wake up" to start the charging cycle and generally doesn't do so until the RPMs pass 1200.
On really cold mornings I have to goose my 300d well beyond that in order for the light to go off.
(An electrical purist will shortly eviscerate me for the underlined part of the explanation, but the general thrust of my answer is sound.)
If you are on the road with normal transmission shifts and the light is still on, then you need to check the charging system.
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Definitely not wrong.
But, there is supposed to be a provision that allows the 'wake up' to occur at low rpm.
Its usually a thin wire leading to the alternator and attaching to the back.
When the wire gets destroyed, or has a bad contact, it will not 'wake up' on low rpm and you will get a battery light until you rev it over 1200rpm-ish