Posted by John T on October 21, 2018 at 08:38:40 from (174.255.15.115):
In Reply to: good then weak spark posted by pinball on October 21, 2018 at 08:17:53:
On a 12 volt tractor IF you have a full true 12 volt rated coil you DO NOT also use an external ballast resistor or else the spark will be weak.
NOTE a coil labeled "12 Volts for use with external ballast" is in reality more like a 6 volt coil and DOES NEED the external ballast (just like it says) or the points will burn quick and the coil overheat HOWEVER a full true 12 volt rated coil that may be labeled "12 Volts" or "12 volts no ballast required" etc is what should be used on a 12 volt tractor.
NOTE a 6 volt coil has somewhere around 1.2 to 2 ohms LV primary winding resistance as measured between its small + and - terminals while a 12 volt coil has more like 2.5 to 3.5
IF ITS A 12 VOLT TRACTOR WITH A FULL TRUE 12 VOLT COIL TOSS THE BALLAST !!!!
NOTE some tractors in lieu of a traditional external bathtub porcelain/ceramic looking ballast used a thermistor wire ballast device which resistance changed once warmed up. If you have that instead of a regular ballast you may have a 6 volt coil. If you have a temperature compensating thermistor type of ballast it may be faulty.
NOTE if its NEG Ground the coils - output goes to distributor and + gets power from the ignition switch perhaps via a series ballast. If its POS Ground reverse that.
I have seen even brand new condensors go bad when once warmed up they fail or grow weak and lower the spark energy IF YOU HAVE THE RIGHT COIL/BALLAST TRY A DIFFERENT OR THE OLD CONDENSOR
I have seen coils go bad and fail ONLY AFTER warmed up !!!
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
... [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.