6 to 12 volt conversion
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=14178
Printed Date: 01 Jan 2026 at 3:59pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 6 to 12 volt conversion
Posted By: jmugoose
Subject: 6 to 12 volt conversion
Date Posted: 21 Jun 2010 at 4:48pm
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I have a 54 Model G. It was my granddaddy's and a few yrs ago he updated it to a 12 volt alternator. He used it all the time, but it would die and he would have to charge it in the barn before using it again. I am under the assumption that he wired it wrong. It is currently set up as negative ground, where doing research I think that it is likely positive ground. Am I correct, I would like some confirmation before switching and having it blow up in my face. Thanks for any help.
Branodn
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Replies:
Posted By: Ted in NE-OH
Date Posted: 21 Jun 2010 at 5:01pm
Alternators are commonly NEGATIVE ground...However there are rare exceptions.
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CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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Posted By: CTuckerNWIL
Date Posted: 21 Jun 2010 at 5:38pm
There is no need to switch it back to pos ground and if alternator is neg ground you can't change it. If you want to change it for a restoration purpose, you will need a generator anyway. After charging the battery, put a volt meter on it . Remember what you get, should be 12v, then start the tractor up and see if you have 13 or more volts. If not the alternator isn't working for whatever reason.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: safetydon
Date Posted: 21 Jun 2010 at 8:02pm
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I have a WD, also positive ground, and a friend did the conversion to 12V for me. He included a convertor to address the reversed polarity and it works great. The one catch is, as he predicted, I fried the 6V starter in exactly 1 year. My friend runs an auto repair shop and I would suspect any good mechanic can do what my friend did for the polarity.
Good Luck,
Don
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Posted By: Brian Jasper co. Ia
Date Posted: 22 Jun 2010 at 12:49pm
Don, how did you fry your starter? I converted my CA about 14 years ago and have never touched the starter. I've always remembered that I have a 6V starter and not grind away on it if the engine doesn't want to start.
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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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Posted By: CTuckerNWIL
Date Posted: 22 Jun 2010 at 1:54pm
There is nothing to address about changing the polarity. Switch the leads around and replace the coil if it has a distributor, and switch the leads on the Amp meter. There is nothing to "convert". My CA and WD45 have been 12v Neg ground for close to 15 years each and never had any trouble with the starter or anything else for that matter.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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