Six volt systems typically use primary windings in the coil of .6 to 2 ohms.
Twelve volt systems (with breaker points) tend to use the same coils with external resistors giving an additional 1.2 - 1.4 ohms in primary resistance.
Twelve volt systems with NO external resistor tend to use the same total primary resistance built into the coil-can. I.e. .6 - 1.8 ohms in the can plus 1.2 - 1.4 ohms external = 1.8 - 3.2 ohms total (and sometime higher).
12 volt breakerless systems often use "six volt" type coils with no external resistor.
A500 12 volt 2.6 ohms primary, 9.8 ohms secondary no external resistor used.
Echlin 4.2 ohms, 4.82M secondary (no ext resistor)
John Deere 6 volt (as used on 430, 1010, etc.) 2.6 ohms prim, 7.12 secondary. Same coil used on Deere tractors with 12 volt systems with added resistor.
Hot Spark brand - HS06HEC - 12 volt HEI, CDI and electronic ignition systems requiring a coil with 0.6 Ohms primary resistance. 11.6 K ohms secondary. HEI, CDI and electronic ignition systems requiring a coil with 0.6 Ohms primary resistance. Can also be used as a 6-volt coil for many applications.
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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
... [Read Article]
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.
