Posted by jdemaris on June 11, 2010 at 06:39:14 from (67.142.130.17):
In Reply to: alternator update posted by karl f on June 10, 2010 at 23:05:08:
No, it does not have to be complicated. It becomes so when you don't have all the data/info. What model of 10SI? What pulley ratio and RPM at testing? What regulator? Was a thorough bench test done?
There are at least four different Delco 10SI model alternators - and you didn't mention which one you have. 10SI can be a #100, #102, #116, #136 and maybe more. They have different cut-in speeds and sometimes different amp-draw on the field circuit.
10SI model # 116 - 61 max amp must spin faster then 1600 RPM to make any charge current.
10SI model # 136 - 63 max amp must spin faster then 1600 RPM to make any charge current.
10SI model # 116 - 72 max amp must spin faster then 1200 RPM to make any charge current.
10SI model # 116 - 72 max amp must spin faster then 1200 RPM to make any charge current.
On the subject of field current and resistors -the voltage drop depends on the ohm-rating of the resistor, supply voltage, AND amp-draw all calculated together. A 10SI can draw up to 3.4 amps on the field circuit, but also some work fine when only drawing 1/2 amp.
I'm not trying to complicate things, but you have to know exactly what you have and what condition it is in.
If your alternator has something wrong with it, and needs as much field current to excite as your ignition coil needs to start the engine - you can't install enough field resistance to stop IGN backfeed (unless you switch it or use a diode).
The reality is, Delco 10SI and 12SI alternators are pretty simple and easy to check and fix. Takes 15 minutes to pull one apart and check everything (slip ring, brushes, diodes, diode-trio, etc.). Regulator can be checked when running via the "full-field" short-plug in back.
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 - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
... [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.
