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No charging light. fitted new alternator which is charging at just over 14 volts. the light does come on however if you disconnect the small wire at the alternator. Any ideas?

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That's normal, that wire is what triggers the light to come on, when there's no voltage going to it, it will turn on, it's like a bad alternator that's not putting out voltage.

Posted on Aug 28, 2010

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It's also important to test/verify that you have a good fully charged battery (with no dead cells) before any tests of the charging system. An alternator needs ample battery power into it before it can produce good charging voltage and amps out of it and back into the battery.

If you test the voltage directly out of the alternator's output post/connector (with the output wire disconnected), you will be reading direct alternator voltage output, which should be approx 13.5 to 14 volts, steady. If the voltage is at ~14 volts, then suddenly cycles down to 9 volts (or anything less than 12 volts), then you have a defective alternator.
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