Yesterday's Tractor Co. Parts for Farm Tractors - Compare our Prices!
Click Here or call 800-853-2651 
   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 in to check your private messagesLog in to check your private messages   Log inLog in 

Generator Output Test


 
Post new topic    
View previous topic :: View next topic  
Author Message
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 412
Location: Illinois

Report to Moderator

PostPosted: Sun Dec 30, 2012 12:48 pm    Post subject: Generator Output Test Reply to specific post Reply with quote

In service manual, it tells you to disconnect armature wire from generator and put a jumper between field terminal and armature terminal on generator. Then measure with 2 lead ammeter between armature wire terminal and armature terminal on generator. My question is, why can't I just use a DC clamp-on ammeter and measure current directly on on red armature wire with everything connected as normal? I tried and I get zero. Tractor starts with no issue so I know battery is charging but I'd like to just test generator to make sure it's putting out the recommended 20 amps @ 1500 rpm.
 
Back to top
View user's profile
JMOR
Tractor Guru


Joined: 13 Aug 2007
Posts: 14565


Report to Moderator

PostPosted: Sun Dec 30, 2012 1:56 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Tom Bond wrote:
(quoted from post at 16:48:06 12/30/12) In service manual, it tells you to disconnect armature wire from generator and put a jumper between field terminal and armature terminal on generator. Then measure with 2 lead ammeter between armature wire terminal and armature terminal on generator. My question is, why can't I just use a DC clamp-on ammeter and measure current directly on on red armature wire with everything connected as normal? I tried and I get zero. Tractor starts with no issue so I know battery is charging but I'd like to just test generator to make sure it's putting out the recommended 20 amps @ 1500 rpm.
Because, "as is" means that the regulator is controlling the amount of charge & if battery is full up, it needs no charge, reg commands gen to provide no charge. Their recommended arrangement commands gen to provide full output. From the description, it appears that you have a post 1952 (8N) tractor?
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 412
Location: Illinois

Report to Moderator

PostPosted: Sun Dec 30, 2012 2:06 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Ahhh.....Makes perfect sense. I do keep it on a 6V battery maintainer to keep charge at full. I'll have to find a different ammeter. My 2 lead is only good to 10 amps.. Tractor is a '58 861. Thanks for your help.....
 
Back to top
View user's profile
Will Gumbert
Regular


Joined: 12 Mar 2012
Posts: 271
Location: Garrett County, MD

Report to Moderator

PostPosted: Sun Dec 30, 2012 2:08 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Tom- You didn't say if this is a 6V or 12V system
and if the tractor is gas or diesel. Really, you
are testing the charging system as a whole,
including the regulator and there needs to be some
load on it, besides charging the battery. If the
battery is nearly new there won't be much charging
current. Some current is used for the ignition
system if it is a gas engine. You could turn on
the headlights, normally about 5A if 12V and 10A
if 6V. The best test is to look at voltage after
starting and when accessories are on, etc.
Voltage should be about 6.5V or 13V respectively
at about 1000rpm. If so, with accessories on, then
all is OK. -Will
 
Back to top
View user's profile
JMOR
Tractor Guru


Joined: 13 Aug 2007
Posts: 14565


Report to Moderator

PostPosted: Sun Dec 30, 2012 2:12 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Tom Bond wrote:
(quoted from post at 18:06:47 12/30/12) Ahhh.....Makes perfect sense. I do keep it on a 6V battery maintainer to keep charge at full. I'll have to find a different ammeter. My 2 lead is only good to 10 amps.. Tractor is a '58 861. Thanks for your help.....
Tom, your clamp on DC ammeter would still be just fine. It is the Armature to Field jumper that commands full output.
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 412
Location: Illinois

Report to Moderator

PostPosted: Sun Dec 30, 2012 6:00 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Just want to be sure before I try. Leave all connections wired "as is" and then jumper the armature and field terminals on generator to command for full load? Then use my DC clamp on red armature wire to measure current going to voltage regulator? Will also check voltage going to battery when running as mentioned in previous reply.
 
Back to top
View user's profile
Tom Bond
Regular


Joined: 02 Sep 2009
Posts: 412
Location: Illinois

Report to Moderator

PostPosted: Sun Dec 30, 2012 6:00 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Just want to be sure before I try. Leave all connections wired "as is" and then jumper the armature and field terminals on generator to command for full load? Then use my DC clamp on red armature wire to measure current going to voltage regulator? Will also check voltage going to battery when running as mentioned in previous reply.
 
Back to top
View user's profile
JMOR
Tractor Guru


Joined: 13 Aug 2007
Posts: 14565


Report to Moderator

PostPosted: Sun Dec 30, 2012 6:03 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

Tom Bond wrote:
(quoted from post at 22:00:39 12/30/12) Just want to be sure before I try. Leave all connections wired "as is" and then jumper the armature and field terminals on generator to command for full load? Then use my DC clamp on red armature wire to measure current going to voltage regulator? Will also check voltage going to battery when running as mentioned in previous reply.
you got it right.
 
Back to top
View user's profile
souNdguy
Tractor Guru


Joined: 20 Aug 2002
Posts: 51639


Report to Moderator

PostPosted: Mon Dec 31, 2012 3:08 pm    Post subject: Re: Generator Output Test Reply to specific post Reply with quote

full field her and check amps and volts...
 
Back to top
View user's profile
Display posts from previous:   
Post new topic    Yesterday's Tractors Forum Index -> Ford All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
TRACTOR   PARTS TRACTOR   MANUALS
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  Expedited shipping available, just call!  Most prices for parts and manuals are below our competitors.  Compare our super low shipping rates!  We have the parts you need to repair your tractor.  We are a Company you can trust and have generous return policies!   Shop Online Today or call our friendly sales staff toll free (800) 853-2651.

YT Home  |  Forums Home

Copyright © 1997-2014 Yesterday's Tractor Co.

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