(800) 853-2651
SHOP NOW

Ignition Coil TO30

S

smrtnez

Member
I ordered a 12 volt coil to replace my old one (12 volt also). But before I put it on I tested the new one with my multimeter on the ohms setting and the new one is reading 1.8? Now I'm not that familiar with all this but correct me if I'm wrong but isn't that telling me its really a 6 volt coil???? The one I was going to replace reads 3.2 on my multimeter, so my old one I was going to replace is a 12 volt, and the one I bought (1.8 ohms) is really a 6 volt that I guess I need to return.
 
Just go to NAPPA (or Equivalent> and buy a ceramic 1 1/2 +/- ohm Ballast resister. It will make your points last longer with your modern coil. (I trust
some will argue), but coils are stupid- 9 of 10 were calibrated to run on more or less 6 volts in point applications. A ballast resister will drop it for
you. Rock on.
 
Sounds like you got a 6v coil.

A common 12v coil is the Napa IC14SB. It does not need a resistor.

But any time you buy a coil, open the box and see what is actually written
on the coil. Many times they get mis boxed, shuffled around, and to most
parts counter personal, a coil is a coil is a coil, no clue there is a
difference.

Still a good idea to take your ohm meter and check it before you buy, many
places won't take electrical parts back!
 
Regardless of markings, a 1.8 ohm coil can be used as is on a 6 volt system. It may be marked 6 volts, or 12 Volts External Resistor Required. As Eric explains you could add a 1.5 ohm resister between coil and switch.

A direct 12 volt NO external resistor required such as NAPA IC14SB should have approximately 3 ohms across + and - posts.

Sounds like you have a 12 Volt External Resistor Required coil. Your options are to exchange it or add the resistor.
 
Post Script: If your local parts guy is a bonehead, just ask for a 1970's single resister ballast resister for Chryslers . Vintage Fords used Resistance Wires. (Would also work for you, but not worth your hassle). I like external resisters (as did majority of OEM car makers) as they are cheap to replace, and you can jump them out to get ya home. No need to toss a $20+ coil when a 6 buck resister dies.
 
You must log in or register to reply here.

Similar threads

J
JMOR, A resistor question.
2
Replies
35
Views
1K
JMOR
J
W
6volt coil in 12 volt system?
Replies
15
Views
1K
Tim PloughNman Daley RIP
T
5
Jubilee no spark
Replies
17
Views
454
Jim.ME
J
I
2n ford front mount disturber
Replies
4
Views
306
Tim PloughNman Daley RIP
T
D
Need for ballast Resistor in 12V conversion
Replies
11
Views
822
Pete in Holland MI
P
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