"My question is what does the 3rd brush do and do I need it with a regulator"
The physical location of the third brush regulates the rate of charge. The closer it is to the fixed brush the more charge, the further away the less charge. Some 3 brush are adjustable (can set third brush closer or further away from fixed brush)
Early 3 brush gennys were seen often when a full fledged automatic Voltage Regulator WAS NOT USED but instead only a simple manual Low or High charge selector light switch.
However, in later years they still used some 3 brush gennys even when they went to a full fledged automatic Voltage Regulator. Later they went to 2 brush gennys and full fledged Voltage Regulators.
COMMON PROBLEMS are the brushes are worn down too short,,,,,,,,the fields may be open or shorted out,,,,,,,,,,,,The splice may be open or shorted where the 2 fields connect together,,,,,,,,,the armature may be shorted to case. A physical inspection and an ohm meter can test for much of that while a growler may be necessary for more precise accurate armatures testing.
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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[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.