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Old 12-20-2015, 02:10 PM   #1
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Default Weird port engine Alternator reading

On the port engine, the voltage seems to dance around at 1200 rpms. The faster the RPM's, the lower the output. But, at 800 RPMS is steady and higher.
Could it be the 2 smaller wires being reversed on the alternator?

See video\

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Old 12-20-2015, 04:44 PM   #2
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Jim when I first got my current boat it did this but not as much bounce. The fault was corrioded battery cables, check them and the alternator connections.

Another possible fault may be the voltage regulator.
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Old 12-20-2015, 04:46 PM   #3
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Regulator is built into the alternator, correct?
All the wiring has just been installed (by me) so, thats all good any tight.
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Old 12-20-2015, 04:49 PM   #4
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Quote:
Originally Posted by Speakrdude View Post
Regulator is built into the alternator, correct?
All the wiring has just been installed (by me) so, thats all good any tight.

Correct.
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Old 12-21-2015, 01:52 PM   #5
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Verify all connections (including grounds) are clean & tight.
I'd suggest using a true voltmeter to check voltages at a few spots to isolate a true issue from a gauge issue.

If their isn't any bounce at the battery or alternator output, then you can; a) rest assured it's not a "true" problem with the charging circuit; and b) start tracing the issue as a faulty gauge/wiring issue.

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