D 12 charging
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=195500
Printed Date: 15 Sep 2025 at 6:58am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D 12 charging
Posted By: Tyee II
Subject: D 12 charging
Date Posted: 02 Jun 2023 at 11:07am
|
I have 2 D 12s 1 recently acquired ser # D12-3537 appears to be 6 volt positive ground ? it has a 12 volt battery hooked up neg ground. ammeter runs negative 15-18 ? Doesnt seem right. any thoughts ? tag on generator is stamped 12 volt 2nd tractor series 3 ser # D12-9355 Has 12 volt battery negative ground, not charging. would like to know what the systems should be on each of these ?
|
Replies:
Posted By: steve(ill)
Date Posted: 02 Jun 2023 at 12:25pm
|
Early D series were 6 volt positive ground.. Later changed to 12 v Positive ground.. In the last 50 years many people have changed them over to 12v Negative ground to match their car/ truck .... The starter and battery dont care... As you said, if you have a 12v battery, it is best to have a 12v generator to match.. Also a 12v Voltage regulator to go with it..The amp meter will run backward if the system was POS ground and you connect the battery NEG ground.. switch the wires on the terminals on back of the amp meter. .... the HIGH AMPS shows that you battery is very low, or your Voltage Regulator has some problems... Many people have just converted over to an alternator with Internal Regulator and simplified the system ..... for testing of the gererator --- read this.. https://www.allischalmers.com/forum/generator-system_topic195497.html" rel="nofollow - https://www.allischalmers.com/forum/generator-system_topic195497.html Its really up to you if you want it Original, or if you want upgrades... Might be nice to have ALL the tractors THE SAME.... My vote would be 12v Negative ground .... Your choice if that is with a generator/ regulator , or a new alternator.
------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 02 Jun 2023 at 12:40pm
this would be a common alternator to use... It eliminates the Voltage Regulator, couple old wires, and the generator.... you need to modify the mount a little to fit.. ONE WIRE or 3 WIRE will work...... if you decide to go with alternator, we can give you more info.. ------------- Like them all, but love the "B"s. |
Posted By: Steve in NJ
Date Posted: 03 Jun 2023 at 7:19am
|
I offer an Alternator retrofit kit for the "D" series Tractors if interested. Visit our website for more info. Steve@B&B ------------- 39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife |