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  • Re: 914 Inconsistent Charging

    by » 4 months ago


    Just insert your probe in the back of the big plug. There is plenty of room to touch the contacts from the back.


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


    Thank you said by: Dave Anderson

  • Re: 914 Inconsistent Charging

    by » 4 months ago


    If you are checking the output voltage of the generator with the engine running, then as Roger says, leave the connector plugged into the regulator and just stick your probes in the backside of the two yellow wires.  This will give you the closed circuit voltage from the alternator.  Remember, this is AC voltage so set your meter accordingly. 

    You should do the other tests I described first - resistance between the two yellow wires, and each yellow wire to ground. These tests must be done with engine and electrical system off, with the yellow wires unplugged.  And yes, it's OK if the entire plug is disconnected for these tests.    


    Thank you said by: Dave Anderson

  • Re: 914 Inconsistent Charging

    by » 4 months ago


    1 G3X master - 2

    Add avionics - 4 (-6)

    2nd G3X -1 (-7)

    Strobes - 1 (-8)

    Landing -3 (-11)

    so are you saying the two fuel pumps  are drawing drawing 8amps?  


    I tested continuity again and .5-.6 across the yellow wires  each yellow to engine ground is showing 14.5-14.7

     


  • Re: 914 Inconsistent Charging

    by » 4 months ago


    The yellow wire to yellow wire reading is fine, but there should be infinite resistance between either yellow wire and engine ground.  In other words, NO continuity at all so NO reading on the meter.  Are you sure that the reading was not 14.5 Mega-ohms?  Some meters auto-scale and you won’t notice it switched to mega-ohms unless you are aware.

    If that was a mega-ohm reading, then that might have been a false reading from current passing through your body by touching the test probe ends while doing the test.  If that was ohms or kilo-ohms then your Stator is shorted to ground and likely needs to be replaced.  Do the ground test again, noting the meter scale, and make sure not to touch the probe ends or bare wires with your fingers during the test.  Your body is a conductor.  


    Here is a photo of a shorted stator we pulled out of a 912iS engine a few weeks back. This had similar test readings, the wire to wire test was in spec, but ground test failed.    I’ve not personally seen this on the 914 but I’m sure it can happen.  

     

     

    34249_2_0D49584B-E71D-4B5D-9308-B46D42B47153.jpeg (You do not have access to download this file.)

    Thank you said by: Dave Anderson

  • Re: 914 Inconsistent Charging

    by » 4 months ago


    Will do the test again and record the meter.  I did notice one of the pins on the regulator was blackened (yellow wire) 

     

     

    34250_2_image0 1.jpeg (You do not have access to download this file.)

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