Yesterday's Tractor Co.
Shop Now View Cart
   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 inLog in 

Battery Charging Sporadic on 881


 
Post new topic    
View previous topic :: View next topic  
Author Message
FarmerBlair
Long Time User


Joined: 28 Jul 2006
Posts: 598


Report to Moderator

PostPosted: Fri Nov 08, 2019 5:17 am    Post subject: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Hi, the charging system on my Ford 881 is acting up. It has the original setup with 6volt generator with positive ground. The charge light on the dash periodically comes on, indicating that the generator is not charging. I confirmed this with a voltmeter showing only 6.7 volts at the battery whether it is running or not and regardless of rpm. When the indicator light is off, the volts at the battery is about 7.6-7.75.
I noticed the indicator light was on one night when the tractor had been running for hours. The next morning, the light was off when starting the cold tractor. Later, the light came back on. I tried switching off and restarting, but that never seemed to help. The wiring is relatively new and connections tight. Seems like if I let the tractor sit and get cold, it will start working.
Then an odd thing happened the other day when I had been using the tractor for a couple hours with the indicator light on: I accidently pressed the starter button BEFORE I turned the ignition key to start the tractor (meaning the tractor turned over as soon as I turned the key). Now the indicator light had gone out and the tractor was charging. It didn't do this the multiple other times I had shut down and restarted the tractor normally. Does this suggest the starter switch is the problem? I am not good with electrical stuff, so please bear with any dumb questions. Not being sure how to check the charge coming directly off the generator, I didn't try that because I didn't want to fry something, including the newer voltage regulator. Thanks!
 
Back to top
View user's profile
Dean
Tractor Guru


Joined: 29 Jan 1998
Posts: 19860


Report to Moderator

PostPosted: Fri Nov 08, 2019 9:06 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Educated guess from available information: Generator brushes or VR contacts.

Dean
 
Back to top
View user's profile
Jim L WA
Long Time User


Joined: 17 Jun 2010
Posts: 733


Report to Moderator

PostPosted: Fri Nov 08, 2019 9:57 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Intermittent problems like that are difficult. It could be something going open in the generator when it get warm or the voltage regulator acting up when it gets warm. The next time it happens, try tapping on the V.R. with the handle of a screwdriver and see what happens. You could do the same with the generator too. If you have an auto electric shop nearby, you could take the generator and V.R. to them and have them checked, but be sure to tell them the whole story, or they guy will just test them cold and tell you they work. I don't want to see you start throwing parts at it, but from my experience lately with new voltage regulators I would suspect that.
 
Back to top
View user's profile
Jim L WA
Long Time User


Joined: 17 Jun 2010
Posts: 733


Report to Moderator

PostPosted: Fri Nov 08, 2019 10:05 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

I forgot to answer your last question. The next time it fails, hook your voltmeter up, set on 20 volts or whatever it says, negative lead to the large post on the generator marked A or ARM and the positive lead to a clean ground and see if you are getting 7 or so volts from there. That will tell you if the generator is putting out.
 
Back to top
View user's profile
FarmerBlair
Long Time User


Joined: 28 Jul 2006
Posts: 598


Report to Moderator

PostPosted: Fri Nov 08, 2019 10:42 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Thanks for the reply Jim, and the explanation for measuring the generator voltage.
 
Back to top
View user's profile
FarmerBlair
Long Time User


Joined: 28 Jul 2006
Posts: 598


Report to Moderator

PostPosted: Fri Nov 08, 2019 10:42 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Thanks Dean
 
Back to top
View user's profile
Dean
Tractor Guru


Joined: 29 Jan 1998
Posts: 19860


Report to Moderator

PostPosted: Fri Nov 08, 2019 11:44 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Be advised: Do not try to use an inexpensive DVM to diagnose an OEM vintage Ford charging system on anything but battery voltage.

Use a vintage analog VOM (mechanical meter type) if you can find one.

Dean
 
Back to top
View user's profile
Dean
Tractor Guru


Joined: 29 Jan 1998
Posts: 19860


Report to Moderator

PostPosted: Fri Nov 08, 2019 11:50 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Having said all that, if your diagnosis indicates that you need (and want) a replacement generator, I have several rebuilt 6V generators for 55-64 Ford tractors (not diesels) that I have decided to sell as I have sold all but two of my vintage Fords. Recently, I have sold two but have 3 or 4 more.

Dean
 
Back to top
View user's profile
FarmerBlair
Long Time User


Joined: 28 Jul 2006
Posts: 598


Report to Moderator

PostPosted: Fri Nov 08, 2019 12:27 pm    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

Thanks Dean! I'll let you know if I need a generator.

I just have a non-analog voltmeter. I'll have to look around for a different one.
 
Back to top
View user's profile
Jim L WA
Long Time User


Joined: 17 Jun 2010
Posts: 733


Report to Moderator

PostPosted: Sat Nov 09, 2019 11:00 am    Post subject: Re: Battery Charging Sporadic on 881 Reply to specific post Reply with quote

yea, I forgot to mention that voltmeter thing. You get some wild readings using a digital meter due to the ignition induction.
 
Back to top
View user's profile
FarmerBlair
Long Time User


Joined: 28 Jul 2006
Posts: 598


Report to Moderator

PostPosted: Thu Nov 14, 2019 1:08 pm    Post subject: Re: Battery Charging Sporadic on 881- DEAN Reply to specific post Reply with quote

Dean,
Looks like I need a new generator. Output on my old generator is 2.3 volts. You mentioned having a few that you are selling. I'm interested. Let me know how to contact.
Thanks!
 
Back to top
View user's profile
JMOR
Tractor Guru


Joined: 13 Aug 2007
Posts: 24468


Report to Moderator

PostPosted: Thu Nov 14, 2019 2:03 pm    Post subject: Re: Battery Charging Sporadic on 881- DEAN Reply to specific post Reply with quote

FarmerBlair wrote:
(quoted from post at 17:08:13 11/14/19) Dean,
Looks like I need a new generator. Output on my old generator is 2.3 volts. You mentioned having a few that you are selling. I'm interested. Let me know how to contact.
Thanks!
while you are measuring that gen Arm voltage, momentarily jumper Arm to Field to see if voltage increases above 2.3v
 
Back to top
View user's profile
Royse
Tractor Guru


Joined: 17 Jan 2011
Posts: 17441
Location: Ionia County Michigan

Report to Moderator

PostPosted: Thu Nov 14, 2019 6:00 pm    Post subject: Re: Battery Charging Sporadic on 881- DEAN Reply to specific post Reply with quote

Don't overlook the obvious either. How's the belt and tension?
Simple and free to check.
 
Back to top
View user's profile
:   
Post new topic    Yesterday's Tractors Forum Index -> Ford All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  

TRACTOR PARTS TRACTOR MANUALS
Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). We have the parts you need to repair your tractor - the right parts. Our fast shipping, low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

YT Home  |  Forums

Modern View Forum 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