Yesterday's Tractor Co. Parts for Farm Tractors - Compare our Prices!
Click Here or call 800-853-2651 
   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   Traditional YT Forum ViewClassic View   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Farmall 140 Charging Circuit


 
Post new topic    
View previous topic :: View next topic  
Author Message
BillyHooper
New User


Joined: 23 Aug 2012
Posts: 2


Report to Moderator

PostPosted: Tue Nov 27, 2012 10:06 am    Post subject: Farmall 140 Charging Circuit Reply to specific post Reply with quote

Installed new Delco alternator on '76 140. Charging voltage seems high, 15.4 Vdc at battery terminals. After extended use the battery got hot and began to smoke. No 'external' voltage regulator visible anywhere. Is regulator internal to alternator? See picture link below. Left wire on resistor was disconnected to prevent further charging until problem is found. Any suggestions on how to correct overcharging problem?

 
Back to top
View user's profile
teddy52food
Tractor Guru


Joined: 05 Mar 2006
Posts: 6362


Report to Moderator

PostPosted: Tue Nov 27, 2012 10:08 am    Post subject: Re: Farmall 140 Charging Circuit Reply to specific post Reply with quote

If everything is wired right, you may need to put a new regulator in the alt.
 
Back to top
View user's profile
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 21409
Location: St. Cloud, MN

Report to Moderator

PostPosted: Tue Nov 27, 2012 11:02 am    Post subject: Re: Farmall 140 Charging Circuit Reply to specific post Reply with quote

15.4 is a bit high, but i am a little concerned with the wire coming from terminal 2 on the edge of the alt. It should connect either to the larger Bat terminal (on the alt.) or to the battery side of the amp meter. This is a sensing terminal that is dedicated to assuring the proper charging voltage.
The battery should survive 15.4 volts for months of intermittant operation.
and it would take many hours of operation in warm conditions to make it smoke.
I suspect a bad cell in the battery. Have that tested first, then if it is fine, go for the VR. They are inexpensive and easy to install inside the Alt. Jim
 
Back to top
View user's profile
Bobinva
Regular


Joined: 22 Mar 2012
Posts: 31


Report to Moderator

PostPosted: Tue Nov 27, 2012 11:03 am    Post subject: Re: Farmall 140 Charging Circuit Reply to specific post Reply with quote


The internal regulator is probably the issue...I had a Focus that the battery died on...I thought it was the alternator had quite working..just the opposite. The regulator went haywire, and the unit was putting out 19 volts instead of 14.5 or so...have that unit redone and you'll probably be OK... I've got a '74 140 with a 12 volt generator that charges just fine...hope it continues... Bobin VA
 
Back to top
View user's profile
rvirgil_KS
Long Time User


Joined: 07 Jul 2007
Posts: 650


Report to Moderator

PostPosted: Tue Nov 27, 2012 6:00 pm    Post subject: Re: Farmall 140 Charging Circuit Reply to specific post Reply with quote

How is the resistor connected into the circuit. Appears to be a resistor used in coil circuit and should have nothing to do with the alternator and is not normally mounted on or near the alternator.

By chance is the #2 wire on the edge plug on the alternator which is cut off on right edge of the picture the same wire that connects back to the right side of the resistor. Where does wire on other side of resistor go? If this side of resistor was connected back to battery source it could drop the voltage at pin 2 causing the sensing circuit in the regulator to see a supposed low battery voltage and increase the voltage output to make up for it.

If this is the case, eliminate the resistor and connect as Janicholson indicates and see if this solves the problem
 
Back to top
View user's profile
Berth 29 opinions
Regular


Joined: 16 Jul 2012
Posts: 104


Report to Moderator

PostPosted: Tue Nov 27, 2012 8:22 pm    Post subject: Re: Farmall 140 Charging Circuit Reply to specific post Reply with quote

I Have a late model 140 (with electrical issues)

With mine, it used to have 12v on one resistor terminal that fed the coil when cranking. When you released the key the resistor I think did supply the current to the coil thru the same wire.

On second thought - your alternator does not have the ground wire from that same bolt (resistor mounting bolt) that runs to a ground on the right side of the engine.... you can try runnning a jumper wire from the bolt to the ground bolt. If the alternator is coming ungrounded - it can cause the same effect you are having.
 
Back to top
View user's profile
Display posts from previous:   
Post new topic    Yesterday's Tractors Forum Index -> Farmall & International Harvester (IHC) All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
TRACTOR   PARTS TRACTOR   MANUALS
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  Expedited shipping available, just call!  Most prices for parts and manuals are below our competitors.  Compare our super low shipping rates!  We have the parts you need to repair your tractor.  We are a Company you can trust and have generous return policies!   Shop Online Today or call our friendly sales staff toll free (800) 853-2651.

YT Home  |  Forums Home

Copyright © 1997-2014 Yesterday's Tractor Co.

Powered by phpBB © 2001, 2005 phpBB Group

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