Posted by John T on August 23, 2016 at 07:37:44 from (216.249.81.101):
In Reply to: spark problem posted by 1951fergusontea20 on August 23, 2016 at 05:08:48:
Since the points are normally closed when the tractors just setting there not running with Ignition ON as you describe, A TEST LAMP OR VOLTMETER ON THE COILS OUTPUT (to distributor) OR THE DISTRIBUTOR TERMINAL FROM THE COIL SHOUILD READ NEAR ZERO VOLTS AND NO LIGHT........NOT battery voltage as you describe.
Put a test light on the distributors output to dist terminal, and with Ign on slowly turn the engine over and the light should flash ON (points open) but OFF (points closed).
If it never goes off and voltage stays the same as on coils input as you describe:
a) Points aren't fully closing b) Points are badly burned or corroded c) Distributor or the points aren't getting a good ground d) A wire or the circuit is open somewhere between coil and distributor and points then ground via point closure.
In order for the coil to fire the coil must conduct current via closed points (no light or voltage on coils output), but then the current is interrupted when the points open IE a test light on coils output to distributor would flash On (points open) and OFF (zero volts when points closed to ground)
For more detailed testing and bench/tractor testing of coil etc see my Ignition Troubleshooting Procedure linked below
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. 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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[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.
