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Got a problem with my 912 ul.
Battery not charging, voltage showing 11.6 at idle and high rpm on the efis. I sh.ould be seeing about 14v at high rpm
Checking the voltage at the two yellow leads gives 11 - 12 v at idle and it climbs to around 14v at 3000rpm. As I understand it I should be seeing 10 - 20 v at idle and 30 - 40 at high rpm.
I tried measuring the ohms at the yellow leads and my meter won't read below 1 ohm and I'm looking for 0.1 - 0.8 ohms.
It's on a Titan Tornado, not easy to work on, so if I have to pull the engine to get at the coils, I'm gonna cry a LOT ?
Any thoughts?
  • Re: Charging problems

    by » one year ago


    You are on the right track. In addition to the tests you already did, test each of the yellow leads to engine ground. There should be no continuity to ground, but I suspect you may find these leads grounded.  Start with the ohm or kilo-ohm scale, that should be adequate for this test.    


    Thank you said by: James Neely

  • Re: Charging problems

    by » one year ago


    You should be seeing 10v+ AC at idle and 30v+ AC at high rpm On the Yellow wires when they are not under load. (Disconnected).
    The most common problem is bad connections.
    Pull the connector Off the regulator and look closely at both halves.
    Reconnect the regulator.

    Engine OFF

    C, R, and B+ to Ground should equal the DC battery voltage. (~12.6)
    Measure the voltage on the Regulator Pins, Not the Connector Pins.
    Most importantly, they should all be the SAME.


    Engine ON

    G to G  should be more than 15V AC.
    C, R, and B+ to Ground should be slightly more than the DC battery voltage and the SAME. (~13v+)

    - - -

    Most meters do not do very well below 5 ohms. You're just asking too much.
    You will need a 4-lead Mili-Ohm Meter to measure that accurately.
    Notice that when touching the probe leads together, the reading is often not zero.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


    Thank you said by: James Neely

  • Re: Charging problems

    by » one year ago


    Well.  After much diagnosing, buying a new multimeter, head scratching, reading advice,(thanks all, by the way), I was struck with a shot of common sense and checked the fuses, DUUHHHH!!!

    Problem solved!?


    Thank you said by: RotaxOwner Admin

  • Re: Charging problems

    by » one year ago


    Caution: Fuses usually "blow" for a reason. Sure replace and see what happens BUT if it blows again, you have a deeper problem.


    Thank you said by: Bill Hertzel

  • Re: Charging problems

    by » one month ago


    What circuit is your fuse on?


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