Coil resistor

All other non-specific model Farmall / IH / CASE tractors. (Catch-All)

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

Coil resistor

Postby ScottyD'sdad » Fri Apr 20, 2012 12:46 pm

My neighbor's 424 died, and had no spark. He replaced the coil, with no success. I changed the points and condenser, still no luck. We bypassed the coil resistor, and its running fine. 12 volt system, 12 volt coil, what is the purpose of the resistor, and can we eliminate it? Coil didn't heat up, with the resistor bypassed. Ed
50 ,52,53,56,59 F Cubs, 55,55,57,63,63 fast hitch, 64 lo-boys, 71 154, 184 lo-boy,61 cadet original. IH spreader,IH corn grinder, Oli. OC3 ,AC D10 ,IH 444 , Potato digger, wagner ldr 3 power units.
ScottyD'sdad
Cub Pro
Cub Pro
 
Posts: 5076
Joined: Thu Aug 31, 2006 7:00 pm
Location: Ma. Rehoboth
Zip Code: 02769
Circle of Safety Award
Circle of Safety: Y

Re: Coil resistor

Postby DanR » Fri Apr 20, 2012 1:02 pm

It sounds like the original 6v coil was replaced with a 12v one . Since the tractor is 12v there is no need for a resistor to drop 12v to 6v.
47 Cub (Glenda)
52 Super A
62 Cub (Genie)
43 H
42 M
In all things know which way the wind is blowing.
DanR
5+ Years
5+ Years
 
Posts: 1631
Joined: Fri Dec 22, 2006 6:28 am
Location: Tennessee East
Zip Code: 37743
Circle of Safety Award
Circle of Safety: Y

Re: Coil resistor

Postby ScottyD'sdad » Fri Apr 20, 2012 3:57 pm

DanR wrote:It sounds like the original 6v coil was replaced with a 12v one . Since the tractor is 12v there is no need for a resistor to drop 12v to 6v.

Thats what I thought, but wanted a second opinion. Thanks, Ed
50 ,52,53,56,59 F Cubs, 55,55,57,63,63 fast hitch, 64 lo-boys, 71 154, 184 lo-boy,61 cadet original. IH spreader,IH corn grinder, Oli. OC3 ,AC D10 ,IH 444 , Potato digger, wagner ldr 3 power units.
ScottyD'sdad
Cub Pro
Cub Pro
 
Posts: 5076
Joined: Thu Aug 31, 2006 7:00 pm
Location: Ma. Rehoboth
Zip Code: 02769
Circle of Safety Award
Circle of Safety: Y

Re: Coil resistor

Postby John *.?-!.* cub owner » Fri Apr 20, 2012 4:32 pm

Make sure the coil says 12 volts, internal resister. Many say 12 volts external resister. The ones that say external resister will run without it fr quite a while but will fail much sooner than with it.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry
User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
 
Posts: 19448
Joined: Sun Feb 02, 2003 2:09 pm
Location: Mo, Potosi
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.

Re: Coil resistor

Postby BIGHOSS » Fri Apr 20, 2012 6:10 pm

I have always had the understanding that a resistor, whether internal or external, is necessary between coil and points to prevent points from burning. Start on full voltage and run on a lesser voltage.
We make a living by what we get, but we make a life by what we give......Winston Churchill
User avatar
BIGHOSS
5+ Years
5+ Years
 
Posts: 1245
Joined: Tue Jul 18, 2006 9:55 pm
Location: TN, Lebanon
Zip Code: 37087
Tractors Owned: 1947 Cub S/N 9216
1960 Cub S/N 217053
1974 Cub S/N 244814
w/ C-22 Mower & C-144 Cultivator

Ford 3000 Gas S/N C375091 w/Bushhog QT2345 Loader & 6' Squealer Bushhog
Circle of Safety Award
Circle of Safety: Y

Re: Coil resistor

Postby John *.?-!.* cub owner » Fri Apr 20, 2012 6:58 pm

To start on full voltage and run on lessor voltage you would need an extra lead from starter relay that bypasses the resister. a resister provides the same drop all the time.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry
User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
 
Posts: 19448
Joined: Sun Feb 02, 2003 2:09 pm
Location: Mo, Potosi
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.

Re: Coil resistor

Postby artc » Wed Aug 01, 2012 11:22 am

to add to what John said, a resister is needed in the circuit - either internally in the coil, or externally in the form of the big white resister. Automobiles in the 60's (12 volt) used a start circuit that connected 12 volts to the coil for starting, then went to the resister setup when you released the key to the run position. on Chrysler and IH vehicles that was done with the resister. on GM products, it was done with a resister wire to the coil. Fords i dont recall but i'm thinking resister.
if you burned out a resister, the engine would start and then die as you released the key. running for an extensive period of time with the resister bypassed will result in burnt points and coil overheating.

a 6 volt coil is just fine on 12 volts with the resister in place.
'If they're tappin', they're not burnin'
http://www.ZagrayFarmMuseum.org
User avatar
artc
Cub Pro
Cub Pro
 
Posts: 1749
Joined: Sun Mar 30, 2003 10:25 am
Location: CT, Middletown
Zip Code: 06457
eBay ID: cmtelephone
Tractors Owned: 1950 cubs (3), 1948 cub, 1941 A, 1948 H, 1963 B414, 1958 240U, 1947 Oliver 60 industrial, Oliver 70 industrial.1948 super AI (trailer queen), 1958 450.


Return to Farmall / IH / CASE

Who is online

Users browsing this forum: No registered users and 2 guests