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

Discussion Forum
:

Converting 6volt to 12 volt system

Welcome Guest, Log in or Register
Author 
Marty Seliga

04-30-2003 06:16:44




Report to Moderator

I am trying to convert my 1955 VAC14 from 6 volt to 12 volt. I was told to and I've installed a GMC alternator with the red wire and brown wire from the alternator connected to the positive wire going back to the battery. The black wire is cut off and loose. The pole screw on the alternator is connected to the ground. The alternator has been checked at auto zone and is putting out fine. I'm only getting 12.4 volts across the battery with the engine running and I am told I should be getting 13.8. Does any one have any suggestions?

[Log in to Reply]   [No Email]
RobertTX

04-30-2003 06:57:43




Report to Moderator
 Re: Converting 6volt to 12 volt system in reply to Marty Seliga, 04-30-2003 06:16:44  
The wire from the hot post should go directly to the battery. If you have an ammeter it should be before the battery on this wire. Of the two wires from the plug, one is the excitation that actually supplies power to the field of the alternator. It should go to a switched 12 volt source. It needs to be a switched source so power is not going to the alternator when the engine is not running. The other wire from the plug is the sensor. It controls output from the alternator. It should go anywhere you have power, but will work best if it is near or wired to the battery. By wiring it to the battery, it wil control alternator output to the battery and will not be affected by voltage drops in the wires. I do not remember which wire is which, if you look closely, they are numbered 1 and 2 on the alternator at the plug. There are some very good articles on this site that explain this better, also you can search the archives for old questions about this. It's not hard to set up right, if it was I couldn't do it. If your tractor does not have a switch, a neat way is to get one of the oil pressure sending units that has prongs for two wires (about $10). Install it in a port that has oil pressure, wire the excitation line through the sending unit, then on to the 12 volt source. When you start thr engine and it makes oil pressure, the sending unit will close its internal switch and power the alternator. When you shut off the engine and oil pressure goes to zero, the swithch will open and shut down the alternator. I wired my 500 diesel this way and it works fine - no switch and no dead battery.

[Log in to Reply]  [No Email]
mj

05-01-2003 18:56:28




Report to Moderator
 Re: Re: Converting 6volt to 12 volt system in reply to RobertTX, 04-30-2003 06:57:43  
Good idea using an oil pressure switch....thanks!



[Log in to Reply]  [No Email]
Allan c.

05-02-2003 13:09:15




Report to Moderator
 Re: Re: Re: Converting 6volt to 12 volt system in reply to mj, 05-01-2003 18:56:28  
I'm assuming you used an alternator with the built in regulator. You must have power to the regulator. That's the terminal FARTHEST from the main charging wire terminal. The close one is to run an idiot light. Put switched power on there and it should work. 12.4 volts is likely the battery voltage so I suspect it's not charging at all.



[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