Farmall & IHC Tractors Discussion Board |
Re: 12V Conversion coil question for John T or oth
[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]
Posted by Bus Driver on April 01, 2007 at 05:59:34 from (66.226.63.228):
In Reply to: 12V Conversion coil question for John T or others posted by Ron in Nebr on March 31, 2007 at 19:45:41:
Just in case anyone is not absolutely clear about the resistors/diodes/lamps used in alternator conversions, one resistor in the supply conductor to the coil is used if the coil is for 6 volt or if the coil requires an external resistor. A diode or lamp will not substitute in this instance. The resistor limits the current primarily to prolong the life of the ignition points. The other device, I personally prefer and use only resistors, is used between the power source and the exciter terminal on the alternator. The most logical power source is the ignition switch since the alternator needs to be excited only when the engine is running. Once charging, the alternator sends/can send power back through that exciter conductor. That would keep the ignition "on"- power to the coil- until the engine stopped for lack of fuel. The resistor/lamp/diode either stops this power feedback or limits it to an amperage value less than that required to power the ignition. Thus moving the ignition switch to "off" really does stop the engine. IH used a 25 ohm resistor for this purpose on the early alternator equipped tractors. I use a 5 watt, 44 ohm wirewound resistor with a shop-made mount and also use epoxy to prevent the resistor from wiggling in the mount. It is mounted to the back of the alternator. Never a failure. The lamp used on many vehicles will have about 55 ohms resistance. Diodes limit current flow to one direction only. Only one of these devices is needed in any particular exciter circuit.
Replies:
Home
| Forums
Today's Featured Article -
The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 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 |
|