Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Classified Ads
Photo Ads
Tractor Parts

Community
Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
TractorLinks.com
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
  
Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

inline resistor from coil

Welcome Guest, Log in or Register
Author  [Modern View]
transtar61

09-12-2017 15:27:45




Report to Moderator

rewiring my farmall 300 is it necessary to put an inline resistor on positive side of the coil if u have a 12 volt coil already . thanks




[Log in to Reply]   [No Email]
John T

09-13-2017 05:12:30




Report to Moderator
 Re: inline resistor from coil in reply to transtar61, 09-12-2017 15:27:45  
1) I believe (NO Warranty) "some" Farmalls used a 6 volt coil on a 12 volt tractor but the ballast resistance was in the form of a resistive wire link NOT a discrete bathtub style looking ballast, so if that's what you have and its still wired that way you need a 6 volt coil...

2) In GENERAL if its a 12 volt tractor and there's NO ballast device, you use a full 12 volt rated coil no ballast required

ORRRRRRRRRRRRRR a 6 volt coil PLUS an external series voltage dropping (12 to 6) ballast resistor

3) A coil labeled "12 Volts" or "12 volts NOT for use with ballast" is a full 12 volt rated coil

4) HOWEVER a coil labeled "12 volts for use with ballast" is in reality just what it says and is more like a 6 volt coil

5) Many (not all) 6 volt coils have a LV primary winding resistance of 1.2 to under 2 ohms while many (not all) 12 volt coils have a LV primary resistance of around 2.5 to 3.5 or so ohms

NOTE since this is an old tractor forum I'm talkin typical old "farm" tractor coils NOT many of the wide variety of auto or truck coils as some American made cars n trucks used 6 volt coils and other 12 volt coils with different ranges of ballast resistances to match the different coil resistances etc etc etc ................

I have found full 12 volt or 6 volt coils at NAPA and they cost less then if bought at Deere or IHC etc

John T

[Log in to Reply]  [No Email]
old

09-12-2017 18:58:51




Report to Moderator
 Re: inline resistor from coil in reply to transtar61, 09-12-2017 15:27:45  
If it is a true 12 volt coil no resister needed but there are coil that are made that say 12 volts but need a resister and then there are one made that do not need a resister so you have to know what you have. Many will say on them 12 volt resister needed and others will say 12 volt no external resister needed



[Log in to Reply]  [No Email]
gene bender

09-13-2017 05:06:36




Report to Moderator
 Re: inline resistor from coil in reply to old, 09-12-2017 18:58:51  
thatswhat i said



[Log in to Reply]  [No Email]
old

09-13-2017 15:02:42




Report to Moderator
 Re: inline resistor from coil in reply to gene bender, 09-13-2017 05:06:36  
All you said was NO which does not tell the guy much if any thing. You know good and well there are coil that are labeled as 12 volt coil but need a ballast resister. You also know there are coil labeled as 12 volt that do not need a ballast resister and depending on which one you have it can cause many odd problems if not wired the correct way



[Log in to Reply]  [No Email]
gene bender

09-12-2017 15:32:08




Report to Moderator
 Re: inline resistor from coil in reply to transtar61, 09-12-2017 15:27:45  
no



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

Hop to:


TRACTOR PARTS TRACTOR MANUALS
Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). 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. [ About Us ]

Home  |  Forums


Copyright © 1997-2016 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