Farm Equipment - AC model B generator

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AC model B generator

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=140720
Printed Date: 17 Sep 2025 at 7:46pm
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Topic: AC model B generator

Posted By: stevebei
Subject: AC model B generator
Date Posted: 23 Jul 2017 at 5:50pm

I'm working on a 1948 model B. Can someone explain to me how to convert a 3-brush generator to 2-brush operation so that it will function with a voltage regulator. Thanks.

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1948 Model B

Replies:

Posted By: Gerald J.
Date Posted: 23 Jul 2017 at 8:48pm

You could take out the third brush but all it does is limit the charging current. You need to have a voltage regulator for the field winding and that's all it takes. Without the third brush the voltage regulator is the current limiter and includes the cutout that was used with the third brush generator.

Gerald J.

Posted By: stevebei
Date Posted: 26 Jul 2017 at 1:02pm

Thanks Gerald. I removed the third brush and connect the wire to the "A" brush. It works fine now with a voltage regulator.

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1948 Model B