Posted by John T on February 17, 2009 at 11:21:55 from (71.55.26.69):
In Reply to: Ford 12v conversion posted by sandcrabsteve on February 17, 2009 at 10:19:26:
Steve, I agree with the other fine gents, do JUST AS THAT COIL SAYS i.e. USE AN EXTERNAL VOLTAGE DROPPING (12 to 6) BALALST RESISTOR otherwise the coil will get too hot and the points will burn up prematurely.....
Coils labeled "12 volts" or "12 volts NOT for use with external ballast resistor" are just as they say and indeed full true 12 volt coils no ballast required... HOWEVER ones labeled "12 volts for use with (or requires) ballast resistor" are in reality 6 volt coils and need the ballast just as they say....
The reason such coils are used on 12 volt tractors is because when cranking especially at low tems where cranking is hard n batetry efficieny is lowered there may only be 9 to 10 volts or less left available at the coil resulting in a weak spark when a good spark is needed the most.....BUTTTTTT if you use a 6 volt coil and by pass that external ballast ONLY WHILE CRANKING you get a better starting spark, then when she starts the voltage dropping n current reducing ballast is back in the circuit so teh coils is at the right current n temperature and the points arent switching more amps then designed for.
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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
... [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.
