A couple things (among others I can post if needed) that can cause premature points burning up are:
1) Weak or Open or not connected or way wrong sized Condensor
2) Excess (too much over 4 amps) coil current caused by:
a) Wrong coil (like a 6 volt coil on a 12 volt system with no external series voltage dropping (12 to 6) ballast resistor)
b) If its a 12 volt tractor and you have a 6 volt coil buttttttttttttt theres too low ohms of ballast. Ballast ohms is near what the coil LV primary ohms is i.e. maybe in the range of 1.25 to 2 ohms.
On a 12 volt tractor you need EITHER
A) A 12 volt coil which may be labeled "12 volts" or "12 volts NO ballast required"
ORRRRRRRRRR
B) A 6 volt coil PLUS an external series voltage dropping (12 to 6) Ballast Resistor
NOTE if the points are having to switch too much over 4 amps of coil current they WILL BURN UP TOO FAST. In order to limit points current to 4 amps on a 12 volt tractor the TOTAL (coil PLUS any Ballast) primary ignition resistance needs to be around 3 ohms as 12/3 = 4 amps
SOOOOOOOOOO insure coil is a "12 volt" or "12 volts NOT for use with ballast" (around 2.5 to 3+ ohms) or if its a 6 volt coil (around 1.25 to 2 ohms) theres sufficient ballast resistance.
NOTE Im talking typical old tractor stock coils here NOT high voltage or high energy or after market or super coils or Accell or Mallory types etc OLD STOCK FARM TRACTOR COILS FOR POINTS IGNITIONS
NOTE if coil is labeled "12 volts for use with or requires ballast" its in reality more like a 6 volt coil and it means what it says BALLAST REQUIRED or esle it will overheat and points burn up fast
Got it??? If I missed anything the other fine gents can add to this
PS Contrary to what most lay persons believe you likely will NOT find a typical old 40's 60's vintage tractor coil that has a stand alone discrete "RESISTOR" tucked away somewhere inside the can.....X Ray or disect one if you like, I bet theres no compartment or seperate area with a "Resistor" hidden inside. NOTE for those in Rio Linda or no electrical expertise whatsoever or are unfamilair with electronics terms and components, A ResisTOR has ResistANCE and wire has some slight ResistANCE butttttttttt a wire is wire and resistORS are resisTORS, if you go to Radio Shack and ask for resistors they wont show you wire and if you ask for wire they wont show you resistors lol
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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
... [Read Article]
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.
