Farm Equipment - Voltage regulator

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Voltage regulator

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=142751
Printed Date: 30 Oct 2025 at 9:39pm
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Topic: Voltage regulator

Posted By: stevebei
Subject: Voltage regulator
Date Posted: 23 Sep 2017 at 3:08pm

My 1948 Model B's generator has been converted to 2-wire. Has anyone replaced the mechanical 6-volt positive ground voltage regulator with an electron one? Any sources for an electronic one? Thanks.

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1948 Model B

Replies:

Posted By: DougS
Date Posted: 23 Sep 2017 at 4:27pm

2-wire? Please explain.

Posted By: stevebei
Date Posted: 24 Sep 2017 at 11:32am

My terminology mistake. I should have said the generator is two-brush as opposed to three brush. A two-brush generator uses a voltage regulator instead of the three-position headlight switch to put a load on the generator.

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1948 Model B

Posted By: Gerald J.
Date Posted: 24 Sep 2017 at 6:21pm

A three brush generator has no different voltage regulation than a generator without a voltage regulator. With constant field current the output voltage is proportional to the shaft speed, but the third brush limits the maximum current so limits voltage a bit that way. It still will overcharge the battery easily. The light switch changes the field current and so the maximum current on the three brush generator.

Gerald J.