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  1. #1

    What should the Magneto Charging coil output?

    Does anyone know or have measured their charge coils AC output?
    I dont mean the 14.5v regulator output.. Before it gets to this.. Direct from the coil.

    Thanks
    Mark.


  2. #2
    BlueFishCrisis's Avatar
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    Quote Originally Posted by Mark-UK View Post
    Does anyone know or have measured their charge coils AC output?
    I dont mean the 14.5v regulator output.. Before it gets to this.. Direct from the coil.

    Thanks
    Mark.
    Which measrement? Positive lead on meter to yellow, negative to ground? or something else...?

    I can check one of my running skis this week....

  3. #3
    Polaris SLT 750 is ideal as this is the same as me.. Meter probe to yellow from coil, and other meter probe to Red/Purple from coil. Polarity doesnt matter as reading AC.. See what your meter reads at tickover and when revved up if possible.
    I had an rpm display of 1000-1200 rpm with about 40volts AC, and when revved up it reached approx 75 volts AC.
    i was using an analogue meter instead of a Digital one, purely as i wanted to check for uneven power or spikes, and a DMM may not be quick enough to read the peak output.. but we will know if mine is way out compared to what you get..

    Cheers.

  4. #4
    BlueFishCrisis's Avatar
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    Quote Originally Posted by Mark-UK View Post
    Polaris SLT 750 is ideal as this is the same as me.. Meter probe to yellow from coil, and other meter probe to Red/Purple from coil. Polarity doesnt matter as reading AC.. See what your meter reads at tickover and when revved up if possible.
    I had an rpm display of 1000-1200 rpm with about 40volts AC, and when revved up it reached approx 75 volts AC.
    i was using an analogue meter instead of a Digital one, purely as i wanted to check for uneven power or spikes, and a DMM may not be quick enough to read the peak output.. but we will know if mine is way out compared to what you get..

    Cheers.
    I don't own an analogue meter, so I'll do the best I can....

  5. #5
    It should still give a good reading, but some can be annoying when they blank out to move the decimal point and change display.. haha

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Mark-UK View Post
    Polaris SLT 750 is ideal as this is the same as me.. Meter probe to yellow from coil, and other meter probe to Red/Purple from coil. Polarity doesnt matter as reading AC.. See what your meter reads at tickover and when revved up if possible.
    I had an rpm display of 1000-1200 rpm with about 40volts AC, and when revved up it reached approx 75 volts AC.
    i was using an analogue meter instead of a Digital one, purely as i wanted to check for uneven power or spikes, and a DMM may not be quick enough to read the peak output.. but we will know if mine is way out compared to what you get..

    Cheers.
    If the LR module voltage regulator is actually working, the output from the coil is not sinusoidal AC

    On one half cycle the voltage output from the stator charging coil is unloaded, on the other half cycle it is delivering current to the battery so is half-wave current loaded.
    Last edited by K447; 07-28-2014 at 04:31 PM.

  7. #7
    My readings were taken whilst Lr module was not connected. half wave rectification only occurs as there is one diode doing the work.. if you stuck a full wave rectifier on the coil it would become a full wave rectification circuit.

  8. #8
    BlueFishCrisis's Avatar
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    When cranking Meter reads 5.6 VAC max. AT 3450 RPM, meter reads 56 VAC max. I did not rev the motor but speaking in a linear fashion this seems to line up with your measurements.....

  9. #9
    BlueFishCrisis's Avatar
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    Bumped the throttle.... 90+ VAC

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by BlueFishCrisis View Post
    Bumped the throttle.... 90+ VAC
    This is useful info

    Gives me an idea how much voltage the MFD has to tolerate on Yellow.

    And how much voltage the LR module needs to handle

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