a) Use a 12 volt nominal rated coil (designed to operate at 12 volts nominal, but still produce a decent spark from like 9 or 10 (starting) to 14 volts and handle the current and sufficiently dissipate the heat and not overheat (around 2.5 to under 4 ohms primary, typical 3 ohms)
OR
b) Use 6 volt nominal rated coil PLUS an external series voltage dropping (12 to 6) Ballast Resistor which reduces the 12 battery volts down to 6 as the coil was designed to handle so it passes the current and dissipates the heat and still produces a decenT spark at starting (maybe 4.5 volts) and running (maybe 7 volts) Their primary winding (of many NOT every one mind you) is around 1.25 to under 2 ohms, around 1.5 typical.
NOTE many 6 or 12 volt tractors still use the same coil butttttttt if on a 12 volt tractor the ballast is in series ahead of them to drop 6 volts leaving 6 on a 6 volt coil AS ITS LABELED AND DESIGNED FOR
NOTE allllllll coils are NOT the same. If you go to NAPA they will ask if you want a 6 or 12 volt they will NOT say they are all the same. (although you can use a 6 on a 12 volt tractor with a ballast, i.e. same coil can still work on either)
NOTE a coil labeled "12 volts" or "12 volts NOT for use with external ballast resistor" is a 12 volt nominal coil HOWEVER a coil labeled "6 volts" or "12 volts for use with an external ballast" is in reality a 6 volt coil i.e. designed to produce a spark at 4.5 to 7 volts AND STILL HANDLE THE CURRENT AND NOTTTTTTT OVERHEAT
NOTE different manufacturers used differnt rated coils and ballast sizes so the above cant be true for alllllllllllllllllllll tractors and coils and Im talking original old farm tractor typical ignitions here NOT after market or high energy like Mallory and Accell etc etc race cars IM TALKIN MOST OLD 6 AND 12 VOLT TYPICAL FARM TRACTORS
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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
... [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.
