I guess its "possible" in translation and in labeling things might? get confusing if different countries are involved ? Another important and limiting factor when it comes to deciding how much total (coil + ballast) ignition circuit resistance is required is to consider the current the ignition points much pass and switch. Typically on many old tractors (sure depends on points design and construction) the current the points must switch is limited to around 3 to 4 max amps, otherwise they will burn prematurely.
THEREFORE at 12 volts if there's 3 ohms of total (coil + ballast) resistance the points current would be 12/3 = 4 amps, while if at 12 volts the total (coil + ballast) resistance were 4 ohms, the current would be 12/4 = 3 amps. As far as ballast resistance, if you wanted a 50/50 voltage divider and used 12 volts as the baseline (higher if charged) and wanted to drop 6 volts across a 6 volt coil and 6 across a ballast, the coils LV primary resistance would be the same as the ballast resistance. However duty cycle and points dwell all play into this equation, and battery voltage will vary subject to temperature, load and state of charge, and charging parameters etc. etc.
Coils (design, voltage and resistance etc) for certain cars or tractors or motorcycles or lawn mowers are certainly NOT all the same...…...
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 ]
Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.
