Rotax 912UL voltmeter flickering

by Gordon Grant in General Tech Discussion 4 years ago

The voltmeter on my Rotax 912 UL has developed a fault. At the cruise (5000 RPM), the needle bounces rapidly between 12 and 14.5 volts. At lower RPM (2000) it sits on 13.8 with only a tiny flicker of the needle. The battery holds its charge perfectly and starting is not an issue. I have replaced the Ducati voltage regulator as a precaution, but it has not made any difference.

Does anyone have any idea on what could be causing this problem?

Gordon

Re: Rotax 912UL voltmeter flickering

by Capt. Siva, » 4 years ago

Capt. Siva,

25 266 738

May be Loose connection on the regulator . Tightened the connection and recheck the voltage.

Read the old thread may be helpful to you.

https://www.rotax-owner.com/en/912-914-technical-questions/3586-912-ul-charging-voltage-too-high

and

https://pointsforpilots.blogspot.com/2012/12/testing-rotax-912914-generator-and.html

Thank you said by: RotaxOwner Admin

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Re: Rotax 912UL voltmeter flickering

by Roger Lee » 4 years ago

Roger Lee

129 5.31k 5.1k

I agree with Xing. This sounds like more of a wire issue. Check the VR wires. Put a wrench or srewdriver on ALL grounds and make sure they are tight. Ground tightness seems to be a reacurring issue more than bad VR's or gauges. They may feel hand tight, but are wrench looose so tighten them all. Check wire connections on the back of your instrument, ect...

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Rotax 912UL voltmeter flickering

by Gordon Grant » 4 years ago

Gordon Grant

3 7 15

Thanks axing, this is really useful and gives me something to investigate.

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Re: Rotax 912UL voltmeter flickering

by Gordon Grant » 4 years ago

Gordon Grant

3 7 15

Of course I meant to say thanks Xing! Sorry.

Thank you said by: Capt. Siva,

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Re: Rotax 912UL voltmeter flickering

by Gordon Grant » 4 years ago

Gordon Grant

3 7 15

Roger,

Thank you for your ideas. I will go through all the earths with great care.

Gordon

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Rotax 912UL voltmeter flickering

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