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John426 
Silver Level
Joined: 14 Aug 2012
Location: France
Points: 302
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 Topic: how to polarize a three brush generator on C
Posted: 10 Sep 2018 at 4:42am |
Hi
I would like to polarize the generator on my Allis C. It is a 3 brush genrator 6 volts;
How i can do it?
Thanks
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Brian Jasper co. Ia
Orange Level
Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 10 Sep 2018 at 7:21am |
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Momentarily jump across the cutout relay on the generator. All it takes is a quick spark. Use a piece of wire about the same thickness as on the tractor.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636
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Posted: 10 Sep 2018 at 9:27am |
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Do that polarization before you start the engine the first time after installing the repaired or shop tested generator.
The three brush generator is normally used without a voltage regulator and the function of the third brush is to act as a current limiter so the generator won't be overworked by a low battery. Its up to the operator to back off the generator with the light switch to keep from over charging the battery but also to be sure the battery is full charged.
Gerald J.
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steigerbro24
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Joined: 26 Jul 2010
Location: Racine Wi
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Posted: 10 Sep 2018 at 12:14pm |
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Is determining if its a 2 brush or 3 brush as simple as opening the band and counting the brushes?
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5 Steigers, 7 John Deeres, 8 Internationals, 4 Case tractors and combines and 1 Oliver
........... Oh wait they're all 1/64.......and a real '44 B
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
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Posted: 10 Sep 2018 at 6:26pm |
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Yes its that easy. But its very likely to be a three brush generator if it has only a cutout and no voltage regulator. The third brush causes a current limiting operation from the magnetic field from the third brush and protects the generator from a battery that would draw more current than the generator is built for. A voltage regulator with three coils inside uses one for cutout, one for voltage regulation, and one for current limiting so the third brush isn't needed but it doesn't hurt much either.
Gerald J.
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John426
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Location: France
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Posted: 11 Sep 2018 at 2:35am |
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Gerald , does it means , that il i put a three coils voltage regulator, i can remove the third brush?
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 11 Sep 2018 at 9:49am |
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Yes the generator will work fine with the third brush and the voltage regulator with current regulator. If the current setting for the current regulator part of the voltage regulator matches the design current rating of the generator, the third brush isn't needed. Getting the voltage regulator with the proper current rating is another variable to be matched along with the wiring of the field that is not so common with the AC generator.
Gerald J.
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