First of all, the 4020 Gas or LP was 12 Volts (ONLY Diesels were 24 Volt) and far as I know (NO warranty) as long as they still used generators instead of alternators they were originally POS ground.
NOTE if you convert to Alternator most all are NEG Ground, so if the tractors was POS ground you need to reverse the polarity for NEG Ground. I hope the alternator wasn't damaged !!!!!!!!
The big main alternator charge wire output (for Neg ground tractor and alternator) would connect to the batterys POS post
To change from POS to NEG ground the coils wires would be swapped HOWEVER it will still fire even if incorrect polarity
If all else is well but theres no fire work through my Troubleshooting Procedure to find the problem, so often its simply the points
PS best I recall there was something else different on LP tractors but I forget what it was ???????? I still thought all were 12 Volts and as long as a generator was used still POS ground original MAYBE AN EXPERT CAN CONFIRM OR REBUT THAT ???????? When they went to alternators then it was NEG ground
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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
... [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.
