You may have slightly excessive voltage drop from battery to the coil but it is not far off. This is the very exact reason that almost all manufacturers use a external ballast in ign circuit. They use that extra terminal on the starter solenoid or starter magnetic switch and run a wire that goes directly to the ign coil, bypassing the external ballast when cranking. Your normal cranking voltage at battery will be about 10.5 volts so you can see you will be getting only about 9.5 volts feeding your 12 volt coil while cranking. This lower voltage will then reduce the amperage flow through the coil and it is the amperage flowing that creates the magnetic field in coil, and when points open, field collapses and creates high voltage in secondary circuit of coil. Less magnetic field, lower secondary voltage available to fire plugs. The best way to , (if I was working on your tractor,)get a better starting machine in your case is, six volt coil , external ballast and different magnetic switch on starter that has the terminal for ignition bypass. That way you would be feeding about 9.5 volts or more to the coil during cranking. Good hot spark.
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 - Talk of the Town: The Pefect Collection - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I thought it would make for some interesting discussion for many of you to post what would be considered your dream or perfect antique tractor collection of five tractors, assuming room for storage and cost were not a factor. I have posted my "Perfect Collection" on the Farmall board. List any brand preference but keep
... [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.
