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

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

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

Research & Info
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

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

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
John Deere Tractors Discussion Forum
Show Parts for Model:

Re: JD 50 Electronic Ignition Coil Temp.

[Show Entire Topic]  

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

01-14-2013 18:31:20

Report to Moderator

Measure the coil current. Odds are it's closer to 8 amps than 4 which it should be. What resistance between the coil primaries?

[Log in to Reply]   [No Email]

01-15-2013 05:41:48

Report to Moderator
 Re: JD 50 Electronic Ignition Coil Temp. in reply to buickanddeere, 01-14-2013 18:31:20  
Or measure the primary dc resistance (may be easier) which should be adequate to privide the 4-5 amperes that you want for your transistor switch to conduct. Taking a nominal 12v and 4 amps you need at least 3 ohms of dc resistance between the power applied from the ignition switch and the coil terminal that goes to the electronic ignition module. If you don't have it, get a ballast resistor in the circuit that will get you there.

Did you get instructions for installation, like a note that says that an xyz ohm ballast resistor is required with this coil?

Some ign. modules warn you that if you over current the circuit, which you seem to be doing, you can kill the module due to overheating the switching transistor.

[Log in to Reply]  [No Email]

01-15-2013 15:23:16

Report to Moderator
 Re: JD 50 Electronic Ignition Coil Temp. in reply to Texasmark1, 01-15-2013 05:41:48  
Now the rest of the story! So I learn this history today, the tractor hasn't been run much in 8 - 10 years. They never could keep it going for long, now I find out (with you fellows help) someone back "then" rewired the tractor - without the resistor! Now to replace it--- any suggestions? What would work that I can get from the auto parts store?

[Log in to Reply]  [No Email]

01-16-2013 05:44:39

Report to Moderator
 Re: JD 50 Electronic Ignition Coil Temp. in reply to HobbySaw, 01-15-2013 15:23:16  
Over the years I have needed resistors and purchased them from NAPA auto stores. Main thing is that it is made for the occasion with some being one value like 1.5 ohms or thereabouts, and others with taps where you could add resistance to get what you want. Then they are mounted on white ceramic bases to insulate them from their mounting since they get hot with 2 holes for mounting.


[Log in to Reply]  [No Email]

01-15-2013 16:12:04

Report to Moderator
 Re: JD 50 Electronic Ignition Coil Temp. in reply to HobbySaw, 01-15-2013 15:23:16  
Does the starter switch have the terminal for bypass starting. Don't let anybody tell you that there really is a resistor inside some coils. Do you want a tractor with bypass starting?

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

Hop to:

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 © 1997-2018 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