This is how it works on paper: Due to voltage drop while cranking the engine, the voltage to the coil also drops. This causes a weak spark that may not be sufficient to start the engine. To remedy this, we use a lower voltage coil that will provide a nioe hot spark at cranking voltage. Once the engine starts, and the starter load on the battery is removed, voltage rises. To accomodate this, a resistor is used to drop the voltage back to the cranking voltage AT THE COIL. To accomplish this, the start button or key switch has a circuit that BYPASSES the resistor during cranking. So, when you are holding down the starter button, the resistor is bypassed and you have spark to start the engine. When you release the button, the circuit is broken, and the engine stalls because the resistor is probably burned out causing the broken circuit. Surprisingly, these resistors take a lot of stress while in operation, and are a relatively common failure, but not as common as I would have expected.
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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [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.
