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

Shop Now

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

Farmall & IHC Tractors Discussion Forum
Order Farmall Cub Parts Online

Farmall cub 6 volt will not charge wiring problems

Welcome Guest, Log in or Register
Author  [Modern View]
Dvss1

05-23-2020 09:59:25




Report to Moderator

Hi all,
Just picked up this cub. Serial #5891. This is 6 volt with a magneto. When I got this it wouldn't charge. I looked at the harness and battery cables and most of the insulation on them all were deteriorated so I bought new ones and installed. So I got her to run but still no charging. So I checked the generator and did the battery to generator test and it did spin. Then I did check the regulator and it does check out. I also did the polarity test since the cables on the battery were negative ground and I changed it back to positive ground. I've looked at a couple of wiring diagrams on the site and wired it to the diagram. One thing that is wired is if I hook the light wire up to the regulator, the light switch begins to smoke!! I can get it to run, take off both battery cables and it still will run, just can't get it to charge. Any help will greatly be appreciated. I've also added some pics. Thanks guys.

Third Party Image

Third Party Image

[Log in to Reply]   [No Email]
Janicholson

05-23-2020 11:13:52




Report to Moderator
 Re: Farmall cub 6 volt will not charge wiring problems in reply to Dvss1, 05-23-2020 09:59:25  
I am answering this with real solutions. give me a half hour. Jim



[Log in to Reply]  [No Email]
Janicholson

05-23-2020 11:40:27




Report to Moderator
 Re: Farmall cub 6 volt will not charge wiring problems in reply to Janicholson, 05-23-2020 11:13:52  
Included is a modified diagram for your 1947 mid (first year) production Cub. Yours was equipped originally with a 4 position light switch. This is really 2 switches on one shaft. One switch controlled the generator charge by completing the field circuit to ground through a resistor, for low charge, or directly to ground for high charge. In both D and B positions of the light switch the gen stays in high charge.
You also have a Mag. This means that the engine will run with no battery because the mag creates its own electricity. to stop the engine the mag is shorted to ground. (by the way don't disconnect a battery while an engine is running, it can let the smoke out of expensive parts.)
Someone has put a voltage regulator on your tractor in place of the cutout relay. This means that the light switch is now going to be used only for the lights, and not for generator control. The lights were originally supplied electricity from a connection to the amp meter. they will now be supplied from the L terminal on the voltage regulator. (note!! the connection that powers the lights is not the one that is on the end of that lower resistor, that terminal is now abandoned and nothing should be attached to it.) The voltage regulator is fully in charge (pun intended) of the generator. When you have it wired like the picture, the last step will be to polarize the generator fields. Do this by connecting from the Voltage regulator Bat terminal, to the Voltage regulator Arm (or Gen) terminal. (not the Field). it will spark but hold the jumper for one second, and repeat one more time. This prepares the field iron poles to charge with positive ground.
The Gen Arm wires from the Generator to the VR and from the VR L and Bat wires should be 10 gauge amp gauge. The F on the gen to the regulator can be 12 gauge. The wire from the amp gauge to the starter switch should also be 10 gauge. The confusion is that the use of a voltage regulator is being spliced into a system that had a cutout, and the system also must compensate for the use of a mag. Third Party Image

[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