gene bender said: (quoted from post at 22:19:42 06/19/13) You need more than 4v into the coil how many volts when cranking
If the wire from the coil to the alternator is going to the #1 terminal on the alternator he is only getting 4 volts into the coil because the exciter wire to the alternator is also connected to the coil. The resistance of the coil in the alternator rotor is added to the resistance of the coil resulting in about twice the resistance of the ballast resistor. The end result is the ballast resistor is dropping the the voltage 8 volts instead of 6. The battery at 12.3 volts is half discharged already and with the additional voltage drop while cranking the voltage is probably only about 3 volts.
On the other hand if he were to pull it to start it, it should start and run since 4 volts should be enough to energize the alternator if it spins fast enough. Once the alternator starts to charge it will send about 14 volts back down the wire to the coil so it should have plenty of spark then. Unfortunately this power source will also keep the engine from stopping when the switch is turned off.
On the other hand if the wire is connected to the #2 terminal on the alternator expect to see about 18 to 20 volts coming out of the alternator.
The solution is to remove the wire that comes from the alternator from the coil and connect it to the ignition switch side of the ballast resister. He will also need to add another resistor or a diode in this wire to drop the voltage enough so the engine may be shut off.
This post was edited by Owen Aaland at 19:51:52 06/19/13.
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 - Magic Moments - by Tyler J. Woods. Magic moments don’t just happen. You have to help them along. This morning, I got up early. It is my day off from my regular workweek and I had a lot of things to do. It’s fall, and with winter coming on, there is a lot of work to do before weather closes in.
... [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.
