(800) 853-2651
SHOP NOW

Farmall 706 Alt. Light stays on

S

Scottsphere

Member
The Alt.light stays on most of the time. When i first start the tractor the light will sometimes go out but after a few minutes the light will come on and stay on. I noticed that the bottom points on the regulator and not staying closed, if i push the closed they will stay closed and the light will go out. I replaced the regulator but its still doing the same thing.
 
Hi Scott,

First order of business is to make darned sure that the belt isn't slipping. If you can turn that alternator fan by hand, it's too loose.

The regulator isn't the problem as it isn't getting enough juice from the alternator to keep it pulled in.

If the belt is good and tight, the problem probably lies in the alternator. Those early alternators were weak in that they would loose a positive diode (light stays on with key off) or a leg of the stator.

Open it up and see if a third of the stator windings have turned black.

Allan
 
Russ is right about the brushes. They get worn & get cockeyed in the holders. While you have it apart, use an ohmmeter & check for continuity between all 3 windings. Check for shorts [grounded condition] between the 3 leads on windings & frame that the windings are on. Should read infinity on all 3 leads to ground.

Continuity should be 0 from lead to lead on all 3 windings.
 
Have you used a volt meter to check the charging voltage across your battery terminals. If your're only seeing 12 volts your alternator probably needs to be rebuilt. It may be cheaper
to buy a rebuilt alternator from your local auto parts store and they can test your old alternator. Hal
 
You must log in or register to reply here.

Similar threads

D
International 784 engine oil pressure
Replies
7
Views
285
BarnyardEngineering
BarnyardEngineering
L
504 Farmall starting issues
Replies
7
Views
350
BarnyardEngineering
BarnyardEngineering
D
Farmall A Service/Repair Manuals
Replies
4
Views
216
Red Dave
Red Dave
M
Ford 555A alternator light
Replies
1
Views
386
wore out
wore out
M
404 finiky lift arms
Replies
0
Views
172
Moonshade
M
Tractor Parts Tractor Manuals

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.

Copyright © 1997-2024 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top