Before replacing the alternator and rewiring, try a couple things first. I am a bit handicapped by not being familiar with the 140 electrical system, but what I see in the wiring diagram, it might be correct for a "1 wire" alternator.( wish your diagram had color codes for all wires :( At the old regulator location, the Gen, L, and BAT wires should be connected together and taped up neatly. At the alternator, connect only the old GEN wire to the alt BAT stud as it appears to be in your picture. Seperate and tape up all other wires at the alternator. Use a 12V test light to make sure you have 12V power at the BAT stud on the alternator.
Make sure the fan and alternator belts are tight so the alternator turns at full speed.
Dig that putty out of the regulator plug hole in the alternator case and with the tractor running half throttle or more, connect a jumper wire from the BAT stud to the left(looking from the rear) #1 regulator blade for a moment. This will "field flash the alternator to start it charging. If a "1 wire" alternator has lost its residual magnetic field, it will not self excite. Once you field flash it, the residual field will be restored and should not need to be done again unless the battery is disconnected or the tractor is not run for many months. If this gets it going, just tidy up the wiring and run it. If not, possibly the alternator has a problem and needs to be repaired.
If you decide to go with the new "3 wire" alt, then you need to add wiring to the excite circuit a Janicolson describes.
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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [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.
