If a coil is labeled "12 Volts" or "12 Volts NOT for use with Ballast Resistor" or "12 Volts NO Ballast Required" etc on a 12 volt tractor YOU DO NOTTTTTTTTTT USE A BALLAST OR THE SPARK WOULD BE VERY WEAK....
If a coil is labeled "6 Volts" or "12 Volts for use with Ballast Resistor" or "12 Volts requires Ballast" etc on a 12 volt tractor YOU NEED AN EXTERNAL SERIES VOLTAGE DROPPING (12 to 6) BALLAST or else the coil overheats and the points burn rapidly.
Om many 12 volt tractors a 6 volt coil plus an external ballast is used so during cranking the ballast can be bypassed (like an extra I terminal on starter solenoid etc to feed coil direct bypassing ballast while starter is engaged) which helps cold weather starting.
If your ballast was by passed someone likely put on a 12 volt coil (instead of correct 6) and did away with the by pass circuit. It will still work okay as is with poorer starting spark in cold weather as if wired correctly with 6 volt coil and solenoid by pass
Contrary to what many lay persons believe, you most likely will NOT find any discrete stand alone "resistor" hidden away inside the coil can. A 12 volt coil has around 2.5 to under 4 ohms primary resistance while a 6 volt coil has more like 1.25 to 2 ohms
Myself and Bob M and Janicholson have explained this hundreds of times on here do a search for more info if needed
That help?? Any more questions?? See URL link below for more
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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[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.