At one time, alternators on small engines were unregulated. Basically the battery was the regulator.
I suspect your unit is a "shunting" regulator. Automotive regulators modulate the alternator field, but most small engines have permanent magnet regulators, so that's not possible. A shunting regulator simply shorts the stator to ground when its voltage exceeds the desired level. Obviously they get pretty hot when the electrical load is light.
Something is not making sense here. "Each phase to ground shows 13.5-14 volts at wide open". OK, that sounds pretty good. I assume this is AC. I'm guessing you have a peak-averaging voltmeter, so it thinks the non-sinusoidal voltage of the stator is about 14 Vrms. (If you looked at the stator output on an oscilloscope, it would be a clipped sine wave.)
Then you say "I am only getting 2 volts output of the regulator now at WOT". Huh? The alternator output is the battery input! So even if the battery is nearly dead you should see more than two volts.
Recheck your voltage AT THE BATTERY. Once you get a reading that makes sense, you can backtrack to the regulator/rectifier and alternator.
Assuming this is a single-phase alternator, it's quite possible you could substitute a stock full-wave bridge rectifier as suggested. Note that these devices have pretty small current ratings. You won't have a regulated output, but you might not have one now.
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 - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
... [Read Article]
Latest Ad:
1965 International Harvester McCormick Farmall cub tractor 2,500. Two owner tractor. My grandfather bought new in 1966, then we inherited it. Have all the paperwork original manual and all maintenance records. It starts and moves. Comes with underbelly mower, plough, and some other attachments.
[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.
