TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Tractor Talk Discussion Forum

Alternator

Welcome Guest, Log in or Register

Author

Cman

05-14-2008 15:36:22

Report to Moderator

I have an alternator on a John Deere 40. Sometimes it does not charge according to the voltage gauge, it does not excite even at full throttle. I used it for an hour this PM and never did show any charge. Used it Saturday and showed charge the whole time. Is there some way to manually excite the alternator and activate it????? ????? Thank you..... ..... .

[Log in to Reply] [No Email]

Bob

05-15-2008 08:29:54

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

[Log in to Reply] [No Email]

john in la

05-15-2008 04:05:19

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

Touch a hot wire to the #1 (field) post. This will excite the alternator.

If you find that you still have problems next time we can tell you how to hook the alternator up in a 3 wire setup so it excites the alternator every time you turn the key on.

[Log in to Reply] [No Email]

Cman

05-14-2008 18:29:36

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

The alternator is a 10SI Delco and the voltmeter was added when I put the alternator on. This is not origional equipment.

[Log in to Reply] [No Email]

buickanddeere

05-14-2008 18:12:39

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

40's had a factory ammeter, not a volt meter.
I agree the "simple" one wire alternator is not a simple solution. An oil pressure switch will also work to control the excitation so they don't run the battery down.

[Log in to Reply] [No Email]

IH2444

05-14-2008 16:11:37

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

I suspect bad brushes / weak brush springs.

[Log in to Reply] [No Email]

Roy Suomi

05-14-2008 16:05:25

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

I've got a 1 wire alt on my Hobart welder..If it sits in winter storage with the battery disconnected , I have to exite it with a jumper wire..My rebuilder says to just pop that rectangular rubber plug off and touch either terminal from the output terminal..Works everytime..Once it's run for a while it charges fine..

[Log in to Reply] [No Email]

old

05-14-2008 15:53:49

Report to Moderator

Re: Alternator in reply to Cman, 05-14-2008 15:36:22

I'm guessing it one of those junk one wire jobs right?? Well on some of those you can pull that little cover off and then go buy the plug that fits and wire it up as a 3 wire and doing that will fix the problem. My self I will never use a 1 wire again plus the 3 wire costs you about half what a 1 wire does if not more. I know the last time I checked a 10SI would cost me $35 plus a $10 core and a 1 wire was around $70 plus a $15 core

Hobby farm

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy