210 Alternator charging issue
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=140207
Printed Date: 31 Oct 2025 at 2:46pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 210 Alternator charging issue
Posted By: Oldoug
Subject: 210 Alternator charging issue
Date Posted: 07 Jul 2017 at 10:16pm
Tonight I put a new rebuilt alternator on my 210...I have been fighting dead batteries for the year I have owned it. I have new batteries and new cables and new alternator in it now. I volt tested at the alternator and the battery and it shows it is not charging (12.3 volts). I have power to the alternator and have tested the ground wire to the alternator also...if I unhook the field terminal it should charge no matter what correct? It still only reads 12.3 volts. Alternator is spinning good and freely. Did I just get a bad rebuilt or what else can I test. Thanks for any help.
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Matt Folkers
FOLKERS RESTORATION
Restoring vintage things to last so the future can enjoy our past.
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Replies:
Posted By: Orange Blood
Date Posted: 07 Jul 2017 at 11:38pm
I haven't worked on our 210 yet, it is still a project waiting, but by the looks of the parts book is has a remote voltage regulator up under the dash cover like the other hundred series, and Two Twenty/D21 tractors. I would look there. Also check your grounds on that regulator.
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Posted By: DougS
Date Posted: 08 Jul 2017 at 3:56am
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You need the field terminal to be connected. I presume you have an external regulator, since you mention the field terminal. If you don't have an external regulator and your alternator has a field terminal, I would presume that you have the wrong alternator installed. If you have an external regulator and it is connected, that regulator may be your problem.
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Posted By: ranger42
Date Posted: 08 Jul 2017 at 8:59am
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I had the same symptoms on our 210 it was voltage regulator on the hood under the cowl cover like others guys have said. I did have one other time we were having trouble and it was a bad ammeter gauge.
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