Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Discussion Forum
:

Electrical Questions

Welcome Guest, Log in or Register
Author 
9N'er

06-28-2000 08:07:59




Report to Moderator

I have some questions while I sort through the process of wiring the 9N. It was converted to 12V. Other priorities are keeping me from going back to the 6V system at this time. So, I will be using the 12V system that came with it. Here are the questions: Resistor: I need to stop down the voltage from 12v TO 6v AT THE COIL...is that correct? 2. What spark plug gap do I need to use? That's it for now. 2 questions, but I suspect there will be more. thanks in advance. 9N'er

[Log in to Reply]   [No Email]
Rick in La.

06-29-2000 14:59:29




Report to Moderator
 Re: Electrical Questions in reply to 9N'er, 06-28-2000 08:07:59  
I'll throw in my 2 cents(although it may not be worth that much). When my grandfather got the 9N that I inherited...it had a 12 volt conversion except the coil...it had a small ceramic resistor on it that worked perfectly. I had to replace that resistor recently and I just happen to know the part num. -- CR-107 --from Walls. Just ask your parts house to match part numbers... I haven't fried points coil or anything else... YET!

Rick

[Log in to Reply]  [No Email]
Rick in La.

06-29-2000 14:51:47




Report to Moderator
 Re: Electrical Questions in reply to 9N'er, 06-28-2000 08:07:59  
I'll throw in my 2 cents(although it may not be worth that much). When my grandfather got the 9N that I inherited...it had a 12 volt conversion except the coil...it had a small ceramic resistor on it that worked perfectly. I had to replace that resistor recently and I just happen to know the part num. -- CR-107 --from Walls. Just ask your parts house to match part numbers... I haven't fried points coil or anything else... YET!

Rick

[Log in to Reply]  [No Email]
Jim WI

06-28-2000 11:39:25




Report to Moderator
 Re: Electrical Questions in reply to 9N'er, 06-28-2000 08:07:59  
If it's an OEM-style 6-volt coil it you want to see about 4 volts at the coil terminal when the points are closed. The resistor needs to be whatever value is needed to give this voltage.

When the points are closed you will see zero volts at the points. When they are open, you will see the battery voltage across them.

If it's a 12v coil, you may still need a small value resistor (many 12 volt coils aren't actually designed to work at the full voltage).

How to tell the difference? Sometimes it's molded into the case of the coil, sometimes there's a label someplace on the coil.

If all else fails, connect the coil as if it were a 6-volt coil (including the proper resistor) and measure the voltage at the coil when you connect it to the battery. If you measure about 4 volts or less with respect to common, the coil is a 6-volt coil and you need the resistor. If you measure much more than 4 volts, you've got a 12v coil.

[Log in to Reply]  [No Email]
9N'er

06-28-2000 08:48:41




Report to Moderator
 Re: Electrical Questions in reply to 9N'er, 06-28-2000 08:07:59  
ANother question regarding the resistor I need: If the coil needs 6V's, what voltage does the condenser receive 6v's? or 4.2V's? that are then provided to the points? The Auto Electric business here in town has a resistor board for auto's; but it is for 12V down to 4.2V's at the condensor and I'm trying to determine if this resistor will work. Otherwise, what do I need to do to simplify this whole thing? it's getting complicated for my small mind. thanks -9n'er

[Log in to Reply]  [No Email]
norm-wy

06-28-2000 09:06:42




Report to Moderator
 Re: Re: Electrical Questions in reply to 9N'er, 06-28-2000 08:48:41  
9N'er
Do you know if there is a 12v or a 6v coil on your N? If you're not sure, did it have a dropping resistor on it before you removed the wiring. There are a number of possibilities when you are dealing with a 12v conversion rather than the original. More info will help. My $0.02 worth



[Log in to Reply]  [No Email]
9N'er

06-28-2000 10:49:49




Report to Moderator
 Re: Re: Re: Electrical Questions in reply to norm-wy, 06-28-2000 09:06:42  
It seems safe to say that there appears to be a ceramic resistor that drops the voltage to the coil...prior to the coil. I can't tell by looking at the coil if it is 12V or 6V, but it appears to be the standard black coil housing that attaches on top of the distibutor...and I'm assuming that the resistor sends 6V's to a 6V coil. Question: does the condensor then take 6V's or 4.2 V's?



[Log in to Reply]  [No Email]
No, No, No - llamas

06-28-2000 11:46:14




Report to Moderator
 Re: Re: Re: Re: Electrical Questions in reply to 9N'er, 06-28-2000 10:49:49  
If you have the standard coil for the 6 volt setup (and it sounds like you do) you need

Whatever Combination Of Resistors Is Required to produce between 3 and 4 volts at the coil top terminal with the points closed.

If you measure this with the points open you can add or subtract resistors until Kingdom come and the voltage will not change. Circuit's open, you see - no current floes, and therefore resistors have no effect.

Do this. Measure the resistance of the coil primary - from the stud on top of the coil to the wire pigtail connector on the bottom. It will be ABOUT 0.7 ohms - you will need a good resistance meter to measure this. Whatever it is, you will need a ballast resistor (or resistors, in series) which totals double the coil primary resistance. If you can't get the exact value, it might be better to have a ballast restor with slightly more than the exact value. Don't go more than about 2.5 times the coil primary value or the coil may not provide sufficient spark. Whatver you do, don't go less or the coil will overhat and its life will be drastically reduced.

HTH

llater,

llamas

[Log in to Reply]  [No Email]
9N'er

06-28-2000 12:15:57




Report to Moderator
 Re: Re: Re: Re: Re: Electrical Questions in reply to No, No, No - llamas, 06-28-2000 11:46:14  
Llama's and others in this posting: This is where my brain becomes so small that I can't see straight, or it gets' so full of new information that my brain capacity suddenly shrinks. In all honesty, I'm lost. I don't have any meters or understanding of this and I may punt, re-install the mishmashed 12V system that came with this old thang, and piece by piece...convert back to 6V over time and assemble it to an original wiring diagram. At least it started and ran...and I will read-up and research the archives in the meantime and sort through this. It's not beyond me; it's just taking the time to understand it now. The adventure continues. 9N'er

[Log in to Reply]  [No Email]
Petro

12-07-2002 16:37:55




Report to Moderator
 Re: Re: Re: Re: Re: Re: Electrical Questions in reply to 9N'er, 06-28-2000 12:15:57  
I need this question answered fast please. Why is it that in a series circuit containing 120v that when two light bulbs having each 25w work when the circuit is on. But when anyone of the bulbs is replaced with a 100w bulb the 25w bulb works but the 100w bulb doesnt. Why is this? Please help. Thank you



[Log in to Reply]  [No Email]
big g

06-28-2000 11:40:20




Report to Moderator
 Re: Re: Re: Re: Electrical Questions in reply to 9N'er, 06-28-2000 10:49:49  
A stock "six" volt coil was not designed to operate at six volts. It required a ballast resistor to drop the operating voltage to 3 or 4 volts at the coil input when the points are closed. A six to a twelve volt conversion might have been done by changing to a larger ballast resistor and using the original "six" V coil, or by changing the coil to a new "twelve" volter.There are several very good postings on this subject in the archives..good hunting...geo

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop 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 ]

Home  |  Forums


Copyright © 1997-2023 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