Just wondering if any one knows how to test a coil to tell if its 6 or 12 volt.
ANSWER: Many original coils designed for use at 6 volts have a primary winding resistance as measured between their small + and - terminals around 1.25 to under 2 ohms (1.5 ohms typical)......THEY ARE LABELED 6 VOLTS
Many original coils designed for use at 12 volts have a primary winding resistance around 2.5 to 3.5 ohms (3 ohms typical)... THEY ARE LABELED 12 VOLTS
One reason being is so the points dont draw and have to switch too much over 4 amps so they dont burn up too quick. If you use a coil designed for 6 volts on a 12 volt tractor unballasted it can overheat badly, while if you use a coil designed for 12 volts on a 6 volt system the spark will be weak
NOTE Im NOT talking about high performance (Mallory and Accel etc) or elec ignition coils, Im talking many older original stock farm tractor coils for points and condensor ignitions THIS IS NOT A PERFECT TEST but when I was a used tractor dealer I used this method many many times AND IT WAS ALWAYS CORRECT. They could make a coil that would work at 6 or 12 volts but my best guess is its ohms would be well over 2. Still when you walk into NAPA they will ask if you want a 6 or 12 volt and will sell you one or the other more likely then they will sell you a UNIVERSAL coil for either 6 or 12 volts (I doubt they will have one)
NEXT does the tractor have a 6 or 12 volt battery?????????????
Is the genny a 6 or 12 volt??? Many 6 volt are black labeled while many 12 are red labeled
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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
... [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.
