Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

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

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Discussion Forum
:

MF 135 12v charging problem

Welcome Guest, Log in or Register
Author 
Steve

03-27-2003 18:33:25




Report to Moderator

I have an ongoing problem with my MF135 diesel. I can charge the battery fully and start the tractor with ease. After running the tractor just a short time, the battery will be too weak to turn it over. This has been a problem for about a year, but I've not had time to address it, and just kept charging it or jumping it to start. It's been updated to a 12V system. I'm guessing the alternator's bad, but could it not also be the regulator? Would anyone have a clue how to test the system to find what component is bad? Thanks for any help you can offer.

[Log in to Reply]   [No Email]
jake

03-29-2003 10:35:36




Report to Moderator
 Re: MF 135 12v charging problem in reply to Steve, 03-27-2003 18:33:25  
if it really does have an alternator, connect a cable directly from the battery's + terminal to the alternator's sense/charging light terminal, it should charge at peak level, at least 13.5 volts. If it still doesn't charge then your alternator is bad, but if it charges then you have a problem with the wiring. This trick doesn't work with generator.

If you have a generator(with mechanical charging relay), you can test it by grounding the smaller of the two terminals on the generator. It should start charging at full power. If it doesn't then you have a problem with te charging relay.

[Log in to Reply]  [No Email]
James, UK

03-28-2003 07:29:00




Report to Moderator
 Re: MF 135 12v charging problem in reply to Steve, 03-27-2003 18:33:25  
Just visiting from the Ferguson forum, but if you have an alternator, you don't need (and shouldn't be using) a regulator box as well - as the alternators are usually fitted with a regulator all of their own.

Have a look in the archives on this forum for 12V conversion and 6V to 12V conversion and alternator questions - it should help you out.



[Log in to Reply]  [No Email]
135

03-28-2003 11:08:22




Report to Moderator
 Re: Re: MF 135 12v charging problem in reply to James, UK, 03-28-2003 07:29:00  
I'm looking at the 135 diesel electrical diagram and it shows voltage regulator with the altenator, also don't remember 135's being 6volt systems????? ?



[Log in to Reply]  [No Email]
James, UK

03-31-2003 01:18:32




Report to Moderator
 Re: Re: Re: MF 135 12v charging problem in reply to 135, 03-28-2003 11:08:22  
No, they never were 6V, but the wiring diagram I was pointing to would have shown it all well enough - it just happened to be for a 6 - 12V conversion. Careful with translating what I write, I speak what you would probably call British English, not American English, and sometimes things get lost in translation (that or my English is cr4p). :-)

My point is that the 135s were mostly/all(?) fitted with a dynamo (and regulator box to handle the DC output regulation).

If this one has been retro-fitted with an alternator (and built in regulator) instead, you won't need the external, dash mounted regulator box, and if it (the regulator box) has been left in the circuit, it will probably stop any charging from happening. The alternator output should go direct to the battery, not via any regulator/control box.

If this 135 has an alternator, AND a regulator box, then I would strongly suspect whoever did the conversion got it wrong, and that this is why there is no charge to the battery.

If it is a dynamo that is still fitted, then the control box is most likely at fault - they need an annual service to clean the internal contacts and you need to re-gap the contacts as well - I think 15 thou (0.38mm) is about right.

Sorry if I caused any confusion/consternation, and hope this clears it up . . . .

[Log in to Reply]  [No Email]
Bill in TN

03-28-2003 03:36:07




Report to Moderator
 Re: MF 135 12v charging problem in reply to Steve, 03-27-2003 18:33:25  
There are several ways to test, but take the alternator off and take it to just about any auto parts store. Most have the equipment and will test it for free.



[Log in to Reply]  [No Email]
richard

03-28-2003 15:54:39




Report to Moderator
 Re: Re: MF 135 12v charging problem in reply to Bill in TN, 03-28-2003 03:36:07  
Your 135 was 12 volt when new.It would most likly had a lucas dynamo with a lucas type R.B.106 voltage control regulator under the dash on the left hand side.The dynamos are very robust,but the voltage contol regulators do suffer from vibratin and are farly prone to failure,it is this what is most likly at fault.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


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