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<p>I have never been around an Allis Chalmers or Ford 6-volt tractor
that the electrical system performed correctly. International
Harvester and John Deere are the only other brands I have any
experience with. I currently have both of those I use and have no
problems at all. I do not have an IH M, but I remember they were
marginal on cranking. 6 volt obviously not enough. Same with
John Deere A. 12-volt fixes both of them. 6 volt simply was
marginal to begin with. As far as charging, I am of the opinion
it has to do with the generator's rpm and in the case of the Ford,
a cheap low output generator. 10 amp generator would take all day
at full speed to charge the battery back up and I doubt anything
other than brand new would put out anywhere close to 10. Doing
chores and such just won't do it.</p>
<p>Ron Cook, Salix, IA<br>
</p>
<div class="moz-cite-prefix">On 3/12/2019 8:26 AM, Ken Knierim
wrote:<br>
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<div dir="ltr">An old-timer friend explained part of the issue
with 6 volt systems. The brushes in the starter will drop about
2 volts out of the 6 volts available just in the brushes IF
they're working correctly. That's a large loss that can't really
be made up by heavy cables or any of the other tricks used on
the 6 volt systems. Adding a couple volts to them really made a
difference IF the charging system could develop that much
voltage. However, many times it wouldn't because the generator
didn't get enough RPM's due to belt losses or slow engine speeds
like our old tractors. So while 8 volt systems were sometimes
OK, there were fewer battery options and sometimes severe system
limitations until 12V was widely adopted.
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<div>I use 12V on the starter for my Case D's. The charging
circuits are all 6 volt and I've been considering a boost
circuit but after Cecil's issues with the Belarus, I've
reconsidered it and may just find a small alternator that I
can fit in there. It'll only work on belt driven ones (the
generator between the drive and magneto might be a tough one
to substitute...) but those projects all take "round tuits"
that seem to be in short supply...</div>
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<div>Ken in AZ</div>
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<div dir="ltr" class="gmail_attr">On Mon, Mar 11, 2019 at 9:49
PM <<a href="mailto:deanvp@att.net" moz-do-not-send="true">deanvp@att.net</a>>
wrote:<br>
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<p class="MsoNormal"><span style="color:windowtext">I’ve
listened to these charging problems but what I haven’t
heard is what the charging voltage is at working
RPM’s. Then what the resulting charging current is at
the working charge voltage. I’m really interested in
trying to understand this problem. If the generator is
doing it’s job then the problem either has to be the
Regulator or Cut Out Relay. On the 6V system I am
familiar with on the 1940 Slant Dash B’s they also had
a 3 position switch that determined how much the
charging rate was desired. But it seems to me that
working back from the battery is the only way to
figure out why the charging system is unreliable.
It isn’t rocket science and I think most if not all
of us can understand the fundamentals. But
something important is being missed. If the 6 volt
batter charging voltage isn’t approaching 7.5 to 8V
“sum ting is wong.” So if that isn’t up to par work
back through the relay and then to the generator. I
would honest guess the problem is the generator . The
disadvantage of a generator over a Alternator is the
generator output is rpm dependent where it isn’t on
the Alternator. But…..usually a tractor is worked at
close to full throttle most of the time so a generator
should be adequate. But maybe there is another issue
here. Maybe 6V is marginal even if everything is
working properly. Many 6V systems are converted to 8V
or 12V systems and then work flawlessly. Even with a
generator. So maybe the bottom line is 6V will never
work very well because it is under designed. For the
job at hand. 6v leaves little to no margin even if
charged and grounded properly. Maybe at 6V we are
fencing with windmills. And maybe 8V or 12V provides
the margin that was needed even from the beginning of
the life of the tractor. Sometimes the laws of
physics are very unforgiving. </span></p>
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<p class="MsoNormal"><span style="color:windowtext">Dean
VP</span></p>
<p class="MsoNormal"><span style="color:windowtext">Apache
junction, AZ</span></p>
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<p class="MsoNormal"><span style="color:windowtext"> </span></p>
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