Posted by LJD on December 16, 2012 at 06:57:14 from (75.194.255.21):
In Reply to: Ignition Resistors posted by K-Mo on December 16, 2012 at 04:19:16:
I think resistors have been talked to death here - but I'll add a few comments anyway.
12 volt systems are designed to make spark with 9 volts, not 12 volts. That because engines crank at 9 volts.
Dedicated external ignition resistors can be "fixed" or "reactive."
Some are wire-wound and some are carbon (built into a wire). GM and Deere used a lot of carbon wire resistors.
Fixed resistor usually uses a system to bypass them while the engine is cranking. Not the case though with a high-resistance coil when all the resistance is "inside the can."
Reactive resistor needs no bypass. It has low resistance until a load is on it and it heats up. Can cause a starting problem if the ignition is left on too long before cranking. Many older Ford tractors use them.
No way is the change from a 2 ohm (fixed) to a 1.8 ohm (fixed) going to fix a no-start situation if all else is as it should be.
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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
... [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.
