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Old Apr 29th 2019, 02:23 PM   #1
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From: Oregon

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I Ride: 1993 Ducati 900 Superlight
Question Alternator AC Output Spec

Before I install a new regulator/rectifier on my 1993 Ducati 900 Superlight, I ran a few quick tests on my alternator. The reading for the AC output across the 2 yellow wires was 30VAC @3,000 rpms & 40VAC @4,000 rpms. Can anyone tell me if this output is consistent with factory specs?

Thank you so much.
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Old Apr 29th 2019, 09:03 PM   #2
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That sounds not wrong.
measuring the voltage is not very exact, you need a good trueRMS and keep the frequency at 50/60 Hz.
It also depends on with/without Load (connector/rectifier/battery).
you can also put 10A on the alternator and measure the Voltage drop to calculate the resistance.
that says nothing about the permeability...

or define it as -should work-
I would also unpin and check all connectors and Mass-points.
Later i can look if Haynes know some Values:

No, there's only the Coil resistance: 2-4 ohm
Regulator: >100Kohm between yellow and red. Everything else should have >2Mohm

Last edited by chris16; Apr 30th 2019 at 11:19 PM.
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alternator, output, spec

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