6 volt gen rebuild

ed1

Member
Pulled my gen off the Jube and put new bearings in it(brushes were good). Do I need to polarize it again?
Thanks,
ed1
 
Ok, my voltage is jumping around all over the place when checked with a volt meter. Since it is positive ground do I need to reverse my leads on the meter. I was checking it with red to the positive post on the battery even though it is positive ground. Did't think to try it the other way.
ed1
 
That is pretty common using a digital voltmeter with mechanical regulator, much easier with needle style.
 
The generator puts out more voltage than the battery needs to recharge. The voltage regulator has contacts that repeatedly open and close rapidly to produce an average output that is the proper voltage for the battery to charge, but modern digital voltmeters will try to read the instantaneous voltage repeatedly and the reading will be all over the place. Older analog voltmeters with a needle that sweeps across the face are not fast enough to notice the rapidly changing voltage and will display the average voltage from the regulator, which is what matters.
 
Your statement is true if one is monitoring the field circuit coming from the regulator, which most people rarely do, nor would they have a good reason to if the battery is at 14+ volts with the engine running. One would never see the fluctuations you mention when checking the voltage at the battery with a digital meter, which again is where most people would check.
 
"My amp meter shows normal charge."

Your ammeter is telling you all you really need to know at this
point, but, if you want confirmation measure the voltage across
the battery terminals when not running, then again while running.
I would expect a good 6V battery to read roughly 6.5V engine off.
7-7.4~ish when running and charging.

An analog meter needs to have a scale capable of discerning that
difference but they are far more tolerant of the noise created
from the various older technologies on these old tractors.

Digital voltmeter will simply read negative voltage if reversed.
An analog will need to have the leads connected correctly.
 

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