Yesterday's Tractor Co.
Shop Now View Cart
   Allis Chalmers Case Farmall IH Ford 9N,2N,8N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   Traditional YT Forum ViewClassic View   RegisterRegister 
 ProfileProfile    Log inLog in 

Denso SI 10 alternator


 
Post new topic    
View previous topic :: View next topic  
Author Message
pburchett
Regular


Joined: 21 Sep 2004
Posts: 315


Report to Moderator

PostPosted: Sat Aug 28, 2021 6:14 pm    Post subject: Denso SI 10 alternator Reply to specific post Reply with quote

I am having trouble with my Denso SI 10 alternator. It is putting out 16+ volts.

I think I have it wired wrong.

Would this be the correct wiring diagram for the Ferguson TO20
I have the number 2 terminal and the Battery lug going to the correct places, or at least like the diagram.

I just was not sure this was the correct diagram and the correct placement of the number 1 lug (attaching it to the resistor).


 
Back to top
View user's profile
J.Wondergem
Tractor Guru


Joined: 05 Mar 2009
Posts: 6434


Report to Moderator

PostPosted: Sun Aug 29, 2021 6:34 am    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote


Is it a Denso, or a Delco? Your drawing is for a Delco.
 
Back to top
View user's profile
tomslik
Regular


Joined: 06 Feb 2006
Posts: 35


Report to Moderator

PostPosted: Sun Aug 29, 2021 8:43 am    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote

put an idiot light in the #1 wire
 
Back to top
View user's profile
Bruce(OR)
Tractor Guru


Joined: 10 Apr 2007
Posts: 3794


Report to Moderator

PostPosted: Sun Aug 29, 2021 1:04 pm    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote

Disconnect battery, hook to headlight. Leave it on to drain the battery down to 12.6 volts static.
Take your Denso alt in for a test.
Rebuild / Replace as needed.
Reinstall, recheck voltage with engine running.
Delco alts generally run 13.2 to 14.8 volts.
 
Back to top
View user's profile
pburchett
Regular


Joined: 21 Sep 2004
Posts: 315


Report to Moderator

PostPosted: Sun Aug 29, 2021 4:41 pm    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote

Sorry. Its a Delco. Just like the drawing.
 
Back to top
View user's profile
Steve@Advance
Tractor Guru


Joined: 12 Nov 2013
Posts: 21107


Report to Moderator

PostPosted: Mon Aug 30, 2021 7:19 pm    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote

The wiring diagram looks good.

Do you have a resistor in the wire between the ignition switch and the # 1 terminal? A small
incandescent lamp is sufficient. Even if there is no resistor, the regulator would still work and
not cause it to overcharge.

One small detail of the drawing, the positioning of the #1 and #2 terminals. On an early Delco
alternator, pre internal regulator, the terminals are parallel as shown in the drawing, and uses a
square harness plug.

A 10SI alternator with an internal regulator will have the terminals end to end and have a
rectangular harness plug.Be sure you have the correct alternator.

If the wiring checks out, take the alternator to an auto supply and have it tested.
 
Back to top
View user's profile
pburchett
Regular


Joined: 21 Sep 2004
Posts: 315


Report to Moderator

PostPosted: Tue Sep 14, 2021 3:52 pm    Post subject: Re: Denso SI 10 alternator Reply to specific post Reply with quote

Got the alternator fixed. It just required a new one! The old one did not have an internal regulator and the new one does. Thanks.
 
Back to top
View user's profile
:   
Post new topic    Yesterday's Tractors Forum Index -> Harry Ferguson All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  

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. [ About Us ]

YT Home  |  Forums

Modern View Forum powered by phpBB © 2001, 2005 phpBB Group

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