This is to any of you Jabiru 3300 (120 HP) engine flyers out there.

I had a new battery that was only 1 year old dye on me in flight, I replaced it with a new battery and in flight my Volt meter is not showing it over 12V? Is there any quick tests for me to do to make sure that its not my Alternator that's at fault?

Comments Please on any quick Alternator tests for me to make sure?

Cheers

Mark

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The maintenance manual says the spec for the alternator lead resistance is 0.4 - 1.1 Ohms.

John

Hey Guy's,

Thanks for everyone's input regarding this issue, but we tracked down what the problem was it was not the Stator, it was the leads running into the voltage regulator from the Stator, one of them had shorted out, this was stopping the Battery from re charging. I have replaced all the connectors in the Voltage Regulator. Everything is running fine now.

Thanks again everyone.

Cheers

Mark

I would be very interested in the On-The-Ground test procedure, and meter readings to watch for, if Arion Aircraft offers any...

Thanks for the thread !

geo.

disconnect the AC stator wires from the regulator, if the connection is burnt repair with crimp joint or solder.

otherwise, measure resistance of the wires to ground, there should be no connection. if there is, you have a winding to frame short.

put AC voltmeter across wires, run engine, voltage should be 25 to 50 Volts. (there are two wiring configurations, so the voltage depends.) low voltage could be shorted turns.

If you can see the coils on the stator, and some are dark colour, suspect shorted turns.

The stator can be rewound.

There is also possibility of magnets loosing strength or rotor / stator scraping to look for. or regulator failure.

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