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Voltage Readings - Page 2
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  1. Re: Voltage Readings 
    #11
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    Nappanee, Indiana
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    RJ....I'm not sure my charge meter is correct either. You mentioned a calibration procedure??
     
     

  2. Re: Voltage Readings 
    #12
    I replaced my analog gauge with a digital one. Peak pack voltage for me is around 41v. Once i get going she will go down to 36-37v. Up hill it swings into the 35v range. Stop and it goes back up to 37-38v. Dead should be 36v with the tractor standing still all accessories off.

    Oh and one thing you can do is plug your meter into the 36V accessory outlet on the front. This will give you a real-time voltage.

    Sorry - third edit.

    I am running 3 - 12v batteries. I do not run them below 50%, Hence my comment about 36v being "dead". I dont know how that translates over to 6v batteries.
    Last edited by roberttroll; 05-09-2011 at 12:33 PM.
     
     

  3. Re: Voltage Readings 
    #13
    Senior Member RJ Kanary's Avatar
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    It's not a 'Procedure', just a way to do it. If you have the OEM EMICO® instruments, remove the lens.At the pivot of the movement you will note a black Luden's cough lozenge shaped device. This is what appears to be a small magnet that can change how the needle sweeps in response to voltage.
    With your voltage standard attached, adjust that lozenge in minute increments until the 'Fuel Gauge' readings approximate the 'set point' for the voltages that should be observed at the boundaries of the various ranges on the meter face.
    A digital read out would be quicker, but what would be the fun in that ? <VBG>

    RJ
    RJ Kanary
    ASE Certified Master Auto Technician.
     
     

  4. Re: Voltage Readings 
    #14
    Senior Member dh1's Avatar
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    The numbers I will list below originally came from a writeup by Larry Ellie:

    Needle just moves: 19.8 V
    Bottom of red: 26.7 V
    Top of red/bottom of green - "E": 33.1 V
    Top of green/bottom of white - "F": 39.0 V
    Top of white/bottom of upper red: 45.5 V
    Top of upper red: 47.3 V

    Hope this helps!

    Nick



    It's not a 'Procedure', just a way to do it. If you have the OEM EMICO® instruments, remove the lens.At the pivot of the movement you will note a black Luden's cough lozenge shaped device. This is what appears to be a small magnet that can change how the needle sweeps in response to voltage.
    With your voltage standard attached, adjust that lozenge in minute increments until the 'Fuel Gauge' readings approximate the 'set point' for the voltages that should be observed at the boundaries of the various ranges on the meter face.
    A digital read out would be quicker, but what would be the fun in that ? <VBG>

    RJ




    Thanks guys good info that's hard to find.
    Thanks Doug from Markham Ont. Canada

    http://www.evalbum.com/3985

    http://www.evalbum.com/4400
     
     

  5. Re: Voltage Readings 
    #15
    Senior Member FarmallMan's Avatar
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    Schenectady, NY, USA
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    Hi Doug,
    Since this was written up, I have tweaked my approach slightly. I measure the resistance of the resistor that's in series with the windings. I compare that resistance to its color code, which is what it should be. I then use the parallel resistance formulas to determine a value of resistor that I can solder in parallel with te existing resistor to restore the original (color coded) resistance value. I have found that doing so returns most meters to correct or nearly correct readings that are very easily adjusted as described by RJ above.

    Nick
     
     

  6. Re: Voltage Readings 
    #16
    Senior Member dh1's Avatar
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    Thanks again I set mine at the top of the green when the battery pack is full charge, 38.1 volts.
    Hopefully that give a better indication than what it was reading before which was 1/4 the way in the green above the red zone.
    Thanks Doug from Markham Ont. Canada

    http://www.evalbum.com/3985

    http://www.evalbum.com/4400
     
     

  7. Re: Voltage Readings 
    #17
    Senior Member dh1's Avatar
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    I think that turning the tab to adjust the needle adjust the tension on the spring, maybe it changes over time, 40yrs time. ???
    Thanks Doug from Markham Ont. Canada

    http://www.evalbum.com/3985

    http://www.evalbum.com/4400
     
     

  8. Re: Voltage Readings 
    #18
    Senior Member FarmallMan's Avatar
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    I think that the little pill that is used for adjustments is magnetic. If you bring a ferrous screw driver near the little pill, the meter needle will deflect. I've found it seems to affect linearity rather than offset. The resistors definitely become more resistive over time, so applying a trimmer resistor in parallel will bring them back down to an appropriate level.

    Nick
     
     

  9. Re: Voltage Readings 
    #19
    Senior Member dh1's Avatar
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    I noticed that also, when the meter is hooked up, if you bring a metal object close to the adjuster, within 1inch, on the meter, the reading changed, I think it changes the magnetic field causing the needle to move. ???
    Thanks Doug from Markham Ont. Canada

    http://www.evalbum.com/3985

    http://www.evalbum.com/4400
     
     

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