912 Alternator voltage at 5000RPM

by William Campbell in 912 / 914 Technical Questions 9 years ago

MY EIS warning light came on today showing 14.0 volts and triggered the alarm that was set to 13.8 Volts. What is the voltage to read on a Rotax 912 at 5000RPM? 13.5 Volts seems like a number I remember. Also, how does the engine regulate the voltage output?

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Re: 912 Alternator voltage at 5000RPM

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

14 should be still acceptable. If you have overvoltage, regulator is broken.

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Re: 912 Alternator voltage at 5000RPM

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.56k

I wouldn't worry to 14.2. Probably should reset the high alarm number a little. Seems normal from what I see and hear which is 13.5-14.0.

Unfortunately instrument accuracy and wiring setup from plane to plane will cause those tenths of a volt difference.

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

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Re: 912 Alternator voltage at 5000RPM

by Mike Goodrich » 9 years ago

Mike Goodrich

8 123 0

Hi
I have the reverse problem of probably low voltage causing the battery (new) to occasionally loose charge.
Where should I connect a volt meter to be able to see if the alternator is delivering or if the regulator is failing?
Thanks for any advise on this.
Mike G

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Re: 912 Alternator voltage at 5000RPM

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

You should measure AC voltage on yellow wires from magneto to regulator.
It there will be ok, check regulator. You can check " Charging System Troubleshooting" video in rotax-owner page.

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Re: 912 Alternator voltage at 5000RPM

by Rhett Mitchell » 9 years ago

Rhett Mitchell

8 99 0

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

Thank you said by: Ken Ryan

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912 Alternator voltage at 5000RPM

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