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Amp/Volt Fluctuations

in 912 / 914 Technical Questions 6 years ago
Hi!

I just completed a cross-country in my 912UL-equipped CTSW. All went well for the entire 20 hours.

I have a question regarding the amps and voltage. The amperage oscillates between 6 and 15 amps, and the voltage fluctuates between 12.3 and 12.8 volts. It has a brand new battery. I did have my iPad and Stratux plugged into the 12V socket. The amps and volts would continue to fluctuate even when I took the plug out of the 12V socket.

Is this normal? If not, any idea what the issue could be?

Thanks in anticipation!

  • Re: Amp/Volt Fluctuations

    by » 6 years ago

    Hi Kevin,
    We need to try and clean the shunt wires. 2 small and 2 large. Then if that doesn't smooth things out we'll put another VR on the engine and see if that doesn't take care of it. It will have to be later this week.

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

      
    Report

  • Re: Amp/Volt Fluctuations

    by » 6 years ago

    Kevin, the Ducati regulator-rectifier is supposed to hold the voltage at 14 plus or minus 0.3 volts. I don't know where you are measuring your voltage, but if you measure it at the regulator output that's what it should be. If you get a good reading at the output, from there you can start moving downstream one connection at a time a taking additional readings until you discover where the voltage is dropping below specification.
      
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  • Re: Amp/Volt Fluctuations

    by » 6 years ago

    Ken - I'm just reading off of the Dynon. Perhaps there's a better place to measure the voltage.

    Roger - after you cleaned the shunt a few weeks ago, all was good with the voltage. It only started dropping and fluctuating on the trip to California. Will catch up to you later this week!
      
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  • Re: Amp/Volt Fluctuations

    by » 6 years ago

    I don't have an ammeter in my Eurostar but the voltage is always 14V when the engine is running. It never varies. I have a fairly light electrical load: radio, transponder and GPS.
      
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  • Re: Amp/Volt Fluctuations

    by » 6 years ago

    Hi Kevin,
    We'll check the VR output voltage. We can ever try another VR. It may just be the Dynon EMS.

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

    Thank you said by: Kevin Hamler
      
    Report
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