Posted by John T on May 15, 2011 at 05:44:20 from (173.243.189.183):
In Reply to: Dumb question posted by notjustair on May 14, 2011 at 19:26:17:
Theres no dumb questions, but one does see dumb answers now n then.
Your basically correct, YES you can use the same points regardless if on a 6 or 12 volt system. The points are a current switching device with a voltage withstand rating FAR FAR HIGHER THEN 6 OR 12 VOLTS ANYWAY...
The points are designed to switch in the vicinity of 4 amps or so but if thats increased drastically they will burn up pretty fast. HOWEVER in a 6 or 12 volt system, that coil current is still close to the same (i.e. 4 amps or so or less)
In a 12 volt system the total primary (coil + any ballast) resistance is around 3 ohms and 12/3 = 4 amps. In a 6 volt system, the total primary resistance is around 1.5 ohms and 6/1.5 again = 4 amps.
If you use a 6 volt coil (around 1.5 ohms) and a series ballast (around 1.5 ohms) on a 12 volt system, the points switch around 4 amps (12/3) ,,,,,,,,,same current as if you used a unballasted 12 volt coil (around 3 ohms),,,,,,,,,same as if you used a 6 volt coil (1.5 ohms) on a 6 volt tractor......
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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
... [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.
