"The second coil was 12v with an internal resistor."
NOT exactly. NO such thing as a modern 12 Volt coil with an INTERNAL resistor... they are simply wound with more wire, making them compatible with 12 Volts WITHOUT the need for a resistor, internal OR external.
Trouble is, it looks to me like the folks from "the land of almost right" are getting it WRONG sometimes nowadays and cheating a bit on the extra wire, making the coils draw more current and run hotter.
Also, if the charging system is putting out over 14 to 14.5 Volts, the coil will draw correspondingly more current.
A breaker point gap that is LESS than "spec" will result in more dwell = more coil heating, as well.
Are you set up to accurately measure primary ignition current... engine "OFF", ignition switch "ON", breaker points CLOSED?
If so, check that out. A typical measurement should be in the little-over-three Amps to about 4 Amps range.
A reading much lower than that will probably mean weak spark, hard starting, and possible misfire, and a reading OVER about 4 Amps is telling you your gonna have a HOT coil and shortened breaker point life.
If the reading IS over 4 Amps, you can try adding a ballast resistor (there are lots over different values out there) to get the current in the desired range. This MAY solve the problem IF the coil hasn't been permanently damaged by the overheating.
If so, you'll have to start over with another coil, and repeat the Amperage draw test to see where you're at.
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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
... [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.
