Your test doesn't give much info unless you can tell us how many amps it is making when you full field it. Also need to know what speed the alternator is turning (not the engine RPM).
That alternator - when full fielded - should easily put out 30 amps @ 15 volts when spinning at 3000 RPM. I don't know off hand what your crank-pulley to alternator-pulley ratio is. Most likely it's 1.5 to 1 ratio (most Deere farm tractors with alternators are). So, for the alternator to spin at 3000 RPM, the engine must be turning at 1920 RPM.
The Delco SI series e.g the 10SI, 12SI, and 18SI are nowhere near as rugged as the old Motorolas. Weak diode trios, no ball-bearings in back, etc. They ARE however, cheap and common and easy to work on without a soldering iron. Deere made a few new tractors with Delcos and they did badly with farm and forestry use.
Full ball bearing Hitachis, or Delco CS alternators are much more rugged then the Delco SIs.
If a 35 amp alternator suits your needs and you want to keep the Motorola - make sure the slip-rings where the brushes ride have not be destroyed by dust. If they are OK, chances are all you need is a diode or two. The isolation diode unbolts off the back and you can change one in 5 minutes. A new one at NAPA is $10.
New regulators are around for less then $20. Prestolite 8RB2007, WAI M5146, etc.
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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter 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.