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 

farmall H electrical problems


 
Post new topic    
View previous topic :: View next topic  
Author Message
tgrewing
Guest






Report to Moderator

PostPosted: Thu Mar 19, 2009 4:39 pm    Post subject: farmall H electrical problems Reply to specific post Reply with quote

i i have a '51 farmall h that has pulled some tricks out of a bag for me. I replaced every piece of wiring on it. new regulator, gen and starter reworked, new coil, new condensor, new points, the whole 9 yards. i am running an 8 volt batt on a 6 volt system, but have a resistor, and it burns the points up in a heartbeat. Im getting 7.4 volts at the distributor. and the points are gapped to .020.

At this point im willing to try anything,
thanks,
Terrell
 
Back to top
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 21296
Location: St. Cloud, MN

Report to Moderator

PostPosted: Thu Mar 19, 2009 5:13 pm    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

Put a amp meter on the system (if it has an amp meter working in the switch box, use it) Turn on the ignition and watch the amp gauge with it stopped. It should show 2 to 3.5 amps draw. If it is more like 6 or 7 amps, I would use a good hand held amp meter (Multi-Meter set to amps, not Milliamps) as follows. Take off the wire on the side of the distributor. Put one ;ead om the distributor post, and one on the wire end you removed. Turn on the ignition (not started) It should read about 3.5 amps or less. More means the coil is not right. (a super hot coil might do this, or a bad coil (even new)). If it is in spec, I suspect oil or grease getting on the points. JimN
 
Back to top
View user's profile
John T
Tractor Guru


Joined: 14 Dec 1998
Posts: 14275


Report to Moderator

PostPosted: Thu Mar 19, 2009 6:31 pm    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

That 7.4 volts you claim is at the distributor puzzles me??????

With the points closed there should be near ZERO volts at the distributor and with them open it should be near full battery voltage which is like 8.4 volts!!!!!!!!!!

You say you have a resistor buttttttttt if its a 6 volt coil on an 8 volt system that ballast resistor (if sized correct) would be quite a bit less resistance then a regular ballast for a 6 volt coil on a 12 volt tractor..

All that aside possible causes or premature points burn up are: 1) Excess current (points and coil), it shouldnt be much over 4 amps if even that high, but if a lot more the points will burn quicker 2) A BAD OR INCORRECT SIZED OR NOT GROUNDED OR MISWIRED OR POORLY GROUNDED CONDENSOR 3) Residue on points 4) Maybe a bad distributor shaft bushing/bearign and the gap is drifting all around

With a 6 volt coil and some sort of ballast on an 8 volt system I dont see excess crrent as the first problem so Id really be checking the condensor and of its wired correct and if its well grounded to the distributor as the cause of premature points burning

Since youre willing to try anythign Id start with a new condensor and insure its ground. Im curious about those voltage readings also. If theres 7.4 volts at the INPUT of the 6 volt coil (NOT the to distributor terminal) when the points are closed n conducting current that may creat a bit of excess current but not enough to quickly fry the points

John T
 
Back to top
View user's profile
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 21296
Location: St. Cloud, MN

Report to Moderator

PostPosted: Fri Mar 20, 2009 5:20 am    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

Something popped into my mind reading your input! what if he wired the "ballast" resistor across the coil (parallel) instead of in series with its input!

Tgrewing, how is that resistor wired , and how much resistance does it have? JimN
 
Back to top
View user's profile
John T Hmmmmmmmm
New User


Joined: 20 Mar 2009
Posts: 1


Report to Moderator

PostPosted: Fri Mar 20, 2009 6:24 am    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

HMMMMMMMMM interesting thought, Ive no doubt that could easily be done and I see how it could increase points current and shorten their life huh. With say a 1.5 ohms ballast in paralell with a 1.5 ohm coil the net resistance is only .75 ohms which reallyyyyyyyy increases points current (8/.75 = 10.66 amps) and reduces spark energy alike

Nice catch if thats what he did and fer sure it would burn the points quickly

JT
 
Back to top
View user's profile
tgrewing
Guest






Report to Moderator

PostPosted: Fri Mar 20, 2009 3:02 pm    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

the resistor is wired as follows:
the hot wire goes striaght into the resistor
wire from oppisite side goes to neg. side of coil
wire from pos. side of coil goes to distributor

SETUP IS POSITIVE GROUND...
Thanks,
terrell
 
Back to top
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 21296
Location: St. Cloud, MN

Report to Moderator

PostPosted: Sat Mar 21, 2009 6:23 am    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

That is correct wiring. I would change out the coil with a different 6v to see if it is the coil, or get us the amp draw. JimN
 
Back to top
View user's profile
tgrewing
Guest






Report to Moderator

PostPosted: Sat Mar 21, 2009 3:09 pm    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

i checked the ground on the condensor....
i took some light sand paper and polished it up
it slowed the process of the points burning up but it still burns them quicker than normal

if anyone has any other solutions, please let me know,
THANKS,
terrell
 
Back to top
Janicholson
Tractor Guru


Joined: 30 Jan 2004
Posts: 21296
Location: St. Cloud, MN

Report to Moderator

PostPosted: Sat Mar 21, 2009 3:34 pm    Post subject: Re: farmall H electrical problems Reply to specific post Reply with quote

Change the condenser (even put the one that came out back in) I have seen many new bad condensers. Condensers are pretty much good for many years unless physically damaged, leaking dielectric, or radically overheated. But new ones can and have been known to be way out of spec. JimN
 
Back to top
View user's profile
Display posts from previous:   
Post new topic    Yesterday's Tractors Forum Index -> Farmall & International Harvester (IHC) 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