|
Tractor Talk Discussion Board |
Re: Re: 12 Volt coil got hot and blew up
[ Expand ] [ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
Posted by RAB on April 28, 2004 at 11:29:54 from (195.93.34.11):
In Reply to: Re: 12 Volt coil got hot and blew up posted by txblu on April 28, 2004 at 09:29:52:
As the coil is an inductor the running current will rise exponentially and so would be less than 70% of the maximum current (when the current will obey Ohm's Law). Remember, as well dwell angle is time points are closed (I forgot and got it wrong way round early one morning!).
Furthermore, even a change from 70% to 100% current is actually a 43% rise in current......and so it will practically be more than this!!
Of course, in a well designed system the cheapest component, or easiest to fix, should have gone pop first - not the most expensive component! - so it might need a smaller (power rating) ballast resistor of a higher ohmic value (if needed) to protect the new coil. Kinda complicated, so I suspect that some non standard parts may have been fitted at some stage, as I am sure the original system would have been tested, like this one, by lots of owners over the years, and not too many coils would have exploded.
Regards, RAB
Follow Ups:
Home
| Forums
| Order Support
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:
1958 FORD RARE 4x4 801 TRACTOR, ELENCO/FRONT DRIVE, FRONTLOADER AND WEIGHTED REAR WHEELS, FIVE SPEED, LIVE PTO, GAS ENGINE, NEW REAR WHEELS AND TIRES, ENGINE RUNS.
[More Ads]
Copyright © 1997-2026 Yesterday's Tractor Co.
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. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|
